1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "aot/aotLoader.hpp" 27 #include "classfile/classFileParser.hpp" 28 #include "classfile/classFileStream.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/javaClasses.hpp" 31 #include "classfile/moduleEntry.hpp" 32 #include "classfile/systemDictionary.hpp" 33 #include "classfile/systemDictionaryShared.hpp" 34 #include "classfile/verifier.hpp" 35 #include "classfile/vmSymbols.hpp" 36 #include "code/dependencyContext.hpp" 37 #include "compiler/compileBroker.hpp" 38 #include "gc/shared/collectedHeap.inline.hpp" 39 #include "gc/shared/specialized_oop_closures.hpp" 40 #include "interpreter/oopMapCache.hpp" 41 #include "interpreter/rewriter.hpp" 42 #include "jvmtifiles/jvmti.h" 43 #include "logging/log.hpp" 44 #include "memory/heapInspection.hpp" 45 #include "memory/iterator.inline.hpp" 46 #include "memory/metadataFactory.hpp" 47 #include "memory/metaspaceShared.hpp" 48 #include "memory/oopFactory.hpp" 49 #include "memory/resourceArea.hpp" 50 #include "oops/fieldStreams.hpp" 51 #include "oops/instanceClassLoaderKlass.hpp" 52 #include "oops/instanceKlass.inline.hpp" 53 #include "oops/instanceMirrorKlass.hpp" 54 #include "oops/instanceOop.hpp" 55 #include "oops/klass.inline.hpp" 56 #include "oops/method.hpp" 57 #include "oops/oop.inline.hpp" 58 #include "oops/symbol.hpp" 59 #include "prims/jvmtiExport.hpp" 60 #include "prims/jvmtiRedefineClasses.hpp" 61 #include "prims/jvmtiThreadState.hpp" 62 #include "prims/methodComparator.hpp" 63 #include "runtime/atomic.hpp" 64 #include "runtime/fieldDescriptor.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/javaCalls.hpp" 67 #include "runtime/mutexLocker.hpp" 68 #include "runtime/orderAccess.inline.hpp" 69 #include "runtime/thread.inline.hpp" 70 #include "services/classLoadingService.hpp" 71 #include "services/threadService.hpp" 72 #include "utilities/dtrace.hpp" 73 #include "utilities/macros.hpp" 74 #include "utilities/stringUtils.hpp" 75 #include "logging/log.hpp" 76 #ifdef COMPILER1 77 #include "c1/c1_Compiler.hpp" 78 #endif 79 80 #ifdef DTRACE_ENABLED 81 82 83 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED 84 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE 85 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT 86 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS 87 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED 88 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT 89 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR 90 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END 91 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \ 92 { \ 93 char* data = NULL; \ 94 int len = 0; \ 95 Symbol* clss_name = name(); \ 96 if (clss_name != NULL) { \ 97 data = (char*)clss_name->bytes(); \ 98 len = clss_name->utf8_length(); \ 99 } \ 100 HOTSPOT_CLASS_INITIALIZATION_##type( \ 101 data, len, class_loader(), thread_type); \ 102 } 103 104 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \ 105 { \ 106 char* data = NULL; \ 107 int len = 0; \ 108 Symbol* clss_name = name(); \ 109 if (clss_name != NULL) { \ 110 data = (char*)clss_name->bytes(); \ 111 len = clss_name->utf8_length(); \ 112 } \ 113 HOTSPOT_CLASS_INITIALIZATION_##type( \ 114 data, len, class_loader(), thread_type, wait); \ 115 } 116 117 #else // ndef DTRACE_ENABLED 118 119 #define DTRACE_CLASSINIT_PROBE(type, thread_type) 120 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) 121 122 #endif // ndef DTRACE_ENABLED 123 124 volatile int InstanceKlass::_total_instanceKlass_count = 0; 125 126 static inline bool is_class_loader(const Symbol* class_name, 127 const ClassFileParser& parser) { 128 assert(class_name != NULL, "invariant"); 129 130 if (class_name == vmSymbols::java_lang_ClassLoader()) { 131 return true; 132 } 133 134 if (SystemDictionary::ClassLoader_klass_loaded()) { 135 const Klass* const super_klass = parser.super_klass(); 136 if (super_klass != NULL) { 137 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) { 138 return true; 139 } 140 } 141 } 142 return false; 143 } 144 145 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) { 146 const int size = InstanceKlass::size(parser.vtable_size(), 147 parser.itable_size(), 148 nonstatic_oop_map_size(parser.total_oop_map_count()), 149 parser.is_interface(), 150 parser.is_anonymous(), 151 should_store_fingerprint()); 152 153 const Symbol* const class_name = parser.class_name(); 154 assert(class_name != NULL, "invariant"); 155 ClassLoaderData* loader_data = parser.loader_data(); 156 assert(loader_data != NULL, "invariant"); 157 158 InstanceKlass* ik; 159 160 // Allocation 161 if (REF_NONE == parser.reference_type()) { 162 if (class_name == vmSymbols::java_lang_Class()) { 163 // mirror 164 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser); 165 } 166 else if (is_class_loader(class_name, parser)) { 167 // class loader 168 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser); 169 } 170 else { 171 // normal 172 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other); 173 } 174 } 175 else { 176 // reference 177 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser); 178 } 179 180 // Check for pending exception before adding to the loader data and incrementing 181 // class count. Can get OOM here. 182 if (HAS_PENDING_EXCEPTION) { 183 return NULL; 184 } 185 186 assert(ik != NULL, "invariant"); 187 188 const bool publicize = !parser.is_internal(); 189 190 // Add all classes to our internal class loader list here, 191 // including classes in the bootstrap (NULL) class loader. 192 loader_data->add_class(ik, publicize); 193 Atomic::inc(&_total_instanceKlass_count); 194 195 return ik; 196 } 197 198 199 // copy method ordering from resource area to Metaspace 200 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) { 201 if (m != NULL) { 202 // allocate a new array and copy contents (memcpy?) 203 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK); 204 for (int i = 0; i < m->length(); i++) { 205 _method_ordering->at_put(i, m->at(i)); 206 } 207 } else { 208 _method_ordering = Universe::the_empty_int_array(); 209 } 210 } 211 212 // create a new array of vtable_indices for default methods 213 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) { 214 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL); 215 assert(default_vtable_indices() == NULL, "only create once"); 216 set_default_vtable_indices(vtable_indices); 217 return vtable_indices; 218 } 219 220 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind) : 221 _static_field_size(parser.static_field_size()), 222 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())), 223 _itable_len(parser.itable_size()), 224 _reference_type(parser.reference_type()) { 225 set_vtable_length(parser.vtable_size()); 226 set_kind(kind); 227 set_access_flags(parser.access_flags()); 228 set_is_anonymous(parser.is_anonymous()); 229 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(), 230 false)); 231 232 assert(NULL == _methods, "underlying memory not zeroed?"); 233 assert(is_instance_klass(), "is layout incorrect?"); 234 assert(size_helper() == parser.layout_size(), "incorrect size_helper?"); 235 } 236 237 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data, 238 Array<Method*>* methods) { 239 if (methods != NULL && methods != Universe::the_empty_method_array() && 240 !methods->is_shared()) { 241 for (int i = 0; i < methods->length(); i++) { 242 Method* method = methods->at(i); 243 if (method == NULL) continue; // maybe null if error processing 244 // Only want to delete methods that are not executing for RedefineClasses. 245 // The previous version will point to them so they're not totally dangling 246 assert (!method->on_stack(), "shouldn't be called with methods on stack"); 247 MetadataFactory::free_metadata(loader_data, method); 248 } 249 MetadataFactory::free_array<Method*>(loader_data, methods); 250 } 251 } 252 253 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data, 254 const Klass* super_klass, 255 Array<Klass*>* local_interfaces, 256 Array<Klass*>* transitive_interfaces) { 257 // Only deallocate transitive interfaces if not empty, same as super class 258 // or same as local interfaces. See code in parseClassFile. 259 Array<Klass*>* ti = transitive_interfaces; 260 if (ti != Universe::the_empty_klass_array() && ti != local_interfaces) { 261 // check that the interfaces don't come from super class 262 Array<Klass*>* sti = (super_klass == NULL) ? NULL : 263 InstanceKlass::cast(super_klass)->transitive_interfaces(); 264 if (ti != sti && ti != NULL && !ti->is_shared()) { 265 MetadataFactory::free_array<Klass*>(loader_data, ti); 266 } 267 } 268 269 // local interfaces can be empty 270 if (local_interfaces != Universe::the_empty_klass_array() && 271 local_interfaces != NULL && !local_interfaces->is_shared()) { 272 MetadataFactory::free_array<Klass*>(loader_data, local_interfaces); 273 } 274 } 275 276 // This function deallocates the metadata and C heap pointers that the 277 // InstanceKlass points to. 278 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) { 279 280 // Orphan the mirror first, CMS thinks it's still live. 281 if (java_mirror() != NULL) { 282 java_lang_Class::set_klass(java_mirror(), NULL); 283 } 284 285 // Need to take this class off the class loader data list. 286 loader_data->remove_class(this); 287 288 // The array_klass for this class is created later, after error handling. 289 // For class redefinition, we keep the original class so this scratch class 290 // doesn't have an array class. Either way, assert that there is nothing 291 // to deallocate. 292 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet"); 293 294 // Release C heap allocated data that this might point to, which includes 295 // reference counting symbol names. 296 release_C_heap_structures(); 297 298 deallocate_methods(loader_data, methods()); 299 set_methods(NULL); 300 301 if (method_ordering() != NULL && 302 method_ordering() != Universe::the_empty_int_array() && 303 !method_ordering()->is_shared()) { 304 MetadataFactory::free_array<int>(loader_data, method_ordering()); 305 } 306 set_method_ordering(NULL); 307 308 // default methods can be empty 309 if (default_methods() != NULL && 310 default_methods() != Universe::the_empty_method_array() && 311 !default_methods()->is_shared()) { 312 MetadataFactory::free_array<Method*>(loader_data, default_methods()); 313 } 314 // Do NOT deallocate the default methods, they are owned by superinterfaces. 315 set_default_methods(NULL); 316 317 // default methods vtable indices can be empty 318 if (default_vtable_indices() != NULL && 319 !default_vtable_indices()->is_shared()) { 320 MetadataFactory::free_array<int>(loader_data, default_vtable_indices()); 321 } 322 set_default_vtable_indices(NULL); 323 324 325 // This array is in Klass, but remove it with the InstanceKlass since 326 // this place would be the only caller and it can share memory with transitive 327 // interfaces. 328 if (secondary_supers() != NULL && 329 secondary_supers() != Universe::the_empty_klass_array() && 330 secondary_supers() != transitive_interfaces() && 331 !secondary_supers()->is_shared()) { 332 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers()); 333 } 334 set_secondary_supers(NULL); 335 336 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces()); 337 set_transitive_interfaces(NULL); 338 set_local_interfaces(NULL); 339 340 if (fields() != NULL && !fields()->is_shared()) { 341 MetadataFactory::free_array<jushort>(loader_data, fields()); 342 } 343 set_fields(NULL, 0); 344 345 // If a method from a redefined class is using this constant pool, don't 346 // delete it, yet. The new class's previous version will point to this. 347 if (constants() != NULL) { 348 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack"); 349 if (!constants()->is_shared()) { 350 MetadataFactory::free_metadata(loader_data, constants()); 351 } 352 // Delete any cached resolution errors for the constant pool 353 SystemDictionary::delete_resolution_error(constants()); 354 355 set_constants(NULL); 356 } 357 358 if (inner_classes() != NULL && 359 inner_classes() != Universe::the_empty_short_array() && 360 !inner_classes()->is_shared()) { 361 MetadataFactory::free_array<jushort>(loader_data, inner_classes()); 362 } 363 set_inner_classes(NULL); 364 365 // We should deallocate the Annotations instance if it's not in shared spaces. 366 if (annotations() != NULL && !annotations()->is_shared()) { 367 MetadataFactory::free_metadata(loader_data, annotations()); 368 } 369 set_annotations(NULL); 370 } 371 372 bool InstanceKlass::should_be_initialized() const { 373 return !is_initialized(); 374 } 375 376 klassItable InstanceKlass::itable() const { 377 return klassItable(const_cast<InstanceKlass*>(this)); 378 } 379 380 void InstanceKlass::eager_initialize(Thread *thread) { 381 if (!EagerInitialization) return; 382 383 if (this->is_not_initialized()) { 384 // abort if the the class has a class initializer 385 if (this->class_initializer() != NULL) return; 386 387 // abort if it is java.lang.Object (initialization is handled in genesis) 388 Klass* super_klass = super(); 389 if (super_klass == NULL) return; 390 391 // abort if the super class should be initialized 392 if (!InstanceKlass::cast(super_klass)->is_initialized()) return; 393 394 // call body to expose the this pointer 395 eager_initialize_impl(); 396 } 397 } 398 399 // JVMTI spec thinks there are signers and protection domain in the 400 // instanceKlass. These accessors pretend these fields are there. 401 // The hprof specification also thinks these fields are in InstanceKlass. 402 oop InstanceKlass::protection_domain() const { 403 // return the protection_domain from the mirror 404 return java_lang_Class::protection_domain(java_mirror()); 405 } 406 407 // To remove these from requires an incompatible change and CCC request. 408 objArrayOop InstanceKlass::signers() const { 409 // return the signers from the mirror 410 return java_lang_Class::signers(java_mirror()); 411 } 412 413 oop InstanceKlass::init_lock() const { 414 // return the init lock from the mirror 415 oop lock = java_lang_Class::init_lock(java_mirror()); 416 // Prevent reordering with any access of initialization state 417 OrderAccess::loadload(); 418 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state 419 "only fully initialized state can have a null lock"); 420 return lock; 421 } 422 423 // Set the initialization lock to null so the object can be GC'ed. Any racing 424 // threads to get this lock will see a null lock and will not lock. 425 // That's okay because they all check for initialized state after getting 426 // the lock and return. 427 void InstanceKlass::fence_and_clear_init_lock() { 428 // make sure previous stores are all done, notably the init_state. 429 OrderAccess::storestore(); 430 java_lang_Class::set_init_lock(java_mirror(), NULL); 431 assert(!is_not_initialized(), "class must be initialized now"); 432 } 433 434 void InstanceKlass::eager_initialize_impl() { 435 EXCEPTION_MARK; 436 HandleMark hm(THREAD); 437 Handle h_init_lock(THREAD, init_lock()); 438 ObjectLocker ol(h_init_lock, THREAD, init_lock() != NULL); 439 440 // abort if someone beat us to the initialization 441 if (!is_not_initialized()) return; // note: not equivalent to is_initialized() 442 443 ClassState old_state = init_state(); 444 link_class_impl(true, THREAD); 445 if (HAS_PENDING_EXCEPTION) { 446 CLEAR_PENDING_EXCEPTION; 447 // Abort if linking the class throws an exception. 448 449 // Use a test to avoid redundantly resetting the state if there's 450 // no change. Set_init_state() asserts that state changes make 451 // progress, whereas here we might just be spinning in place. 452 if (old_state != _init_state) 453 set_init_state(old_state); 454 } else { 455 // linking successfull, mark class as initialized 456 set_init_state(fully_initialized); 457 fence_and_clear_init_lock(); 458 // trace 459 if (log_is_enabled(Info, class, init)) { 460 ResourceMark rm(THREAD); 461 log_info(class, init)("[Initialized %s without side effects]", external_name()); 462 } 463 } 464 } 465 466 467 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization 468 // process. The step comments refers to the procedure described in that section. 469 // Note: implementation moved to static method to expose the this pointer. 470 void InstanceKlass::initialize(TRAPS) { 471 if (this->should_be_initialized()) { 472 initialize_impl(CHECK); 473 // Note: at this point the class may be initialized 474 // OR it may be in the state of being initialized 475 // in case of recursive initialization! 476 } else { 477 assert(is_initialized(), "sanity check"); 478 } 479 } 480 481 482 bool InstanceKlass::verify_code(bool throw_verifyerror, TRAPS) { 483 // 1) Verify the bytecodes 484 Verifier::Mode mode = 485 throw_verifyerror ? Verifier::ThrowException : Verifier::NoException; 486 return Verifier::verify(this, mode, should_verify_class(), THREAD); 487 } 488 489 490 // Used exclusively by the shared spaces dump mechanism to prevent 491 // classes mapped into the shared regions in new VMs from appearing linked. 492 493 void InstanceKlass::unlink_class() { 494 assert(is_linked(), "must be linked"); 495 _init_state = loaded; 496 } 497 498 void InstanceKlass::link_class(TRAPS) { 499 assert(is_loaded(), "must be loaded"); 500 if (!is_linked()) { 501 link_class_impl(true, CHECK); 502 } 503 } 504 505 // Called to verify that a class can link during initialization, without 506 // throwing a VerifyError. 507 bool InstanceKlass::link_class_or_fail(TRAPS) { 508 assert(is_loaded(), "must be loaded"); 509 if (!is_linked()) { 510 link_class_impl(false, CHECK_false); 511 } 512 return is_linked(); 513 } 514 515 bool InstanceKlass::link_class_impl(bool throw_verifyerror, TRAPS) { 516 if (DumpSharedSpaces && is_in_error_state()) { 517 // This is for CDS dumping phase only -- we use the in_error_state to indicate that 518 // the class has failed verification. Throwing the NoClassDefFoundError here is just 519 // a convenient way to stop repeat attempts to verify the same (bad) class. 520 // 521 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown 522 // if we are executing Java code. This is not a problem for CDS dumping phase since 523 // it doesn't execute any Java code. 524 ResourceMark rm(THREAD); 525 THROW_MSG_(vmSymbols::java_lang_NoClassDefFoundError(), external_name(), false); 526 } 527 // return if already verified 528 if (is_linked()) { 529 return true; 530 } 531 532 // Timing 533 // timer handles recursion 534 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl"); 535 JavaThread* jt = (JavaThread*)THREAD; 536 537 // link super class before linking this class 538 Klass* super_klass = super(); 539 if (super_klass != NULL) { 540 if (super_klass->is_interface()) { // check if super class is an interface 541 ResourceMark rm(THREAD); 542 Exceptions::fthrow( 543 THREAD_AND_LOCATION, 544 vmSymbols::java_lang_IncompatibleClassChangeError(), 545 "class %s has interface %s as super class", 546 external_name(), 547 super_klass->external_name() 548 ); 549 return false; 550 } 551 552 InstanceKlass* ik_super = InstanceKlass::cast(super_klass); 553 ik_super->link_class_impl(throw_verifyerror, CHECK_false); 554 } 555 556 // link all interfaces implemented by this class before linking this class 557 Array<Klass*>* interfaces = local_interfaces(); 558 int num_interfaces = interfaces->length(); 559 for (int index = 0; index < num_interfaces; index++) { 560 InstanceKlass* interk = InstanceKlass::cast(interfaces->at(index)); 561 interk->link_class_impl(throw_verifyerror, CHECK_false); 562 } 563 564 // in case the class is linked in the process of linking its superclasses 565 if (is_linked()) { 566 return true; 567 } 568 569 // trace only the link time for this klass that includes 570 // the verification time 571 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(), 572 ClassLoader::perf_class_link_selftime(), 573 ClassLoader::perf_classes_linked(), 574 jt->get_thread_stat()->perf_recursion_counts_addr(), 575 jt->get_thread_stat()->perf_timers_addr(), 576 PerfClassTraceTime::CLASS_LINK); 577 578 // verification & rewriting 579 { 580 HandleMark hm(THREAD); 581 Handle h_init_lock(THREAD, init_lock()); 582 ObjectLocker ol(h_init_lock, THREAD, init_lock() != NULL); 583 // rewritten will have been set if loader constraint error found 584 // on an earlier link attempt 585 // don't verify or rewrite if already rewritten 586 // 587 588 if (!is_linked()) { 589 if (!is_rewritten()) { 590 { 591 bool verify_ok = verify_code(throw_verifyerror, THREAD); 592 if (!verify_ok) { 593 return false; 594 } 595 } 596 597 // Just in case a side-effect of verify linked this class already 598 // (which can sometimes happen since the verifier loads classes 599 // using custom class loaders, which are free to initialize things) 600 if (is_linked()) { 601 return true; 602 } 603 604 // also sets rewritten 605 rewrite_class(CHECK_false); 606 } else if (is_shared()) { 607 SystemDictionaryShared::check_verification_constraints(this, CHECK_false); 608 } 609 610 // relocate jsrs and link methods after they are all rewritten 611 link_methods(CHECK_false); 612 613 // Initialize the vtable and interface table after 614 // methods have been rewritten since rewrite may 615 // fabricate new Method*s. 616 // also does loader constraint checking 617 // 618 // initialize_vtable and initialize_itable need to be rerun for 619 // a shared class if the class is not loaded by the NULL classloader. 620 ClassLoaderData * loader_data = class_loader_data(); 621 if (!(is_shared() && 622 loader_data->is_the_null_class_loader_data())) { 623 ResourceMark rm(THREAD); 624 vtable().initialize_vtable(true, CHECK_false); 625 itable().initialize_itable(true, CHECK_false); 626 } 627 #ifdef ASSERT 628 else { 629 vtable().verify(tty, true); 630 // In case itable verification is ever added. 631 // itable().verify(tty, true); 632 } 633 #endif 634 set_init_state(linked); 635 if (JvmtiExport::should_post_class_prepare()) { 636 Thread *thread = THREAD; 637 assert(thread->is_Java_thread(), "thread->is_Java_thread()"); 638 JvmtiExport::post_class_prepare((JavaThread *) thread, this); 639 } 640 } 641 } 642 return true; 643 } 644 645 646 // Rewrite the byte codes of all of the methods of a class. 647 // The rewriter must be called exactly once. Rewriting must happen after 648 // verification but before the first method of the class is executed. 649 void InstanceKlass::rewrite_class(TRAPS) { 650 assert(is_loaded(), "must be loaded"); 651 if (is_rewritten()) { 652 assert(is_shared(), "rewriting an unshared class?"); 653 return; 654 } 655 Rewriter::rewrite(this, CHECK); 656 set_rewritten(); 657 } 658 659 // Now relocate and link method entry points after class is rewritten. 660 // This is outside is_rewritten flag. In case of an exception, it can be 661 // executed more than once. 662 void InstanceKlass::link_methods(TRAPS) { 663 int len = methods()->length(); 664 for (int i = len-1; i >= 0; i--) { 665 methodHandle m(THREAD, methods()->at(i)); 666 667 // Set up method entry points for compiler and interpreter . 668 m->link_method(m, CHECK); 669 } 670 } 671 672 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access) 673 void InstanceKlass::initialize_super_interfaces(TRAPS) { 674 assert (has_nonstatic_concrete_methods(), "caller should have checked this"); 675 for (int i = 0; i < local_interfaces()->length(); ++i) { 676 Klass* iface = local_interfaces()->at(i); 677 InstanceKlass* ik = InstanceKlass::cast(iface); 678 679 // Initialization is depth first search ie. we start with top of the inheritance tree 680 // has_nonstatic_concrete_methods drives searching superinterfaces since it 681 // means has_nonstatic_concrete_methods in its superinterface hierarchy 682 if (ik->has_nonstatic_concrete_methods()) { 683 ik->initialize_super_interfaces(CHECK); 684 } 685 686 // Only initialize() interfaces that "declare" concrete methods. 687 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) { 688 ik->initialize(CHECK); 689 } 690 } 691 } 692 693 void InstanceKlass::initialize_impl(TRAPS) { 694 HandleMark hm(THREAD); 695 696 // Make sure klass is linked (verified) before initialization 697 // A class could already be verified, since it has been reflected upon. 698 link_class(CHECK); 699 700 DTRACE_CLASSINIT_PROBE(required, -1); 701 702 bool wait = false; 703 704 // refer to the JVM book page 47 for description of steps 705 // Step 1 706 { 707 Handle h_init_lock(THREAD, init_lock()); 708 ObjectLocker ol(h_init_lock, THREAD, init_lock() != NULL); 709 710 Thread *self = THREAD; // it's passed the current thread 711 712 // Step 2 713 // If we were to use wait() instead of waitInterruptibly() then 714 // we might end up throwing IE from link/symbol resolution sites 715 // that aren't expected to throw. This would wreak havoc. See 6320309. 716 while(is_being_initialized() && !is_reentrant_initialization(self)) { 717 wait = true; 718 ol.waitUninterruptibly(CHECK); 719 } 720 721 // Step 3 722 if (is_being_initialized() && is_reentrant_initialization(self)) { 723 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait); 724 return; 725 } 726 727 // Step 4 728 if (is_initialized()) { 729 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait); 730 return; 731 } 732 733 // Step 5 734 if (is_in_error_state()) { 735 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait); 736 ResourceMark rm(THREAD); 737 const char* desc = "Could not initialize class "; 738 const char* className = external_name(); 739 size_t msglen = strlen(desc) + strlen(className) + 1; 740 char* message = NEW_RESOURCE_ARRAY(char, msglen); 741 if (NULL == message) { 742 // Out of memory: can't create detailed error message 743 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className); 744 } else { 745 jio_snprintf(message, msglen, "%s%s", desc, className); 746 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message); 747 } 748 } 749 750 // Step 6 751 set_init_state(being_initialized); 752 set_init_thread(self); 753 } 754 755 // Step 7 756 // Next, if C is a class rather than an interface, initialize it's super class and super 757 // interfaces. 758 if (!is_interface()) { 759 Klass* super_klass = super(); 760 if (super_klass != NULL && super_klass->should_be_initialized()) { 761 super_klass->initialize(THREAD); 762 } 763 // If C implements any interface that declares a non-static, concrete method, 764 // the initialization of C triggers initialization of its super interfaces. 765 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and 766 // having a superinterface that declares, non-static, concrete methods 767 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) { 768 initialize_super_interfaces(THREAD); 769 } 770 771 // If any exceptions, complete abruptly, throwing the same exception as above. 772 if (HAS_PENDING_EXCEPTION) { 773 Handle e(THREAD, PENDING_EXCEPTION); 774 CLEAR_PENDING_EXCEPTION; 775 { 776 EXCEPTION_MARK; 777 // Locks object, set state, and notify all waiting threads 778 set_initialization_state_and_notify(initialization_error, THREAD); 779 CLEAR_PENDING_EXCEPTION; 780 } 781 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait); 782 THROW_OOP(e()); 783 } 784 } 785 786 787 // Look for aot compiled methods for this klass, including class initializer. 788 AOTLoader::load_for_klass(this, THREAD); 789 790 // Step 8 791 { 792 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl"); 793 JavaThread* jt = (JavaThread*)THREAD; 794 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait); 795 // Timer includes any side effects of class initialization (resolution, 796 // etc), but not recursive entry into call_class_initializer(). 797 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(), 798 ClassLoader::perf_class_init_selftime(), 799 ClassLoader::perf_classes_inited(), 800 jt->get_thread_stat()->perf_recursion_counts_addr(), 801 jt->get_thread_stat()->perf_timers_addr(), 802 PerfClassTraceTime::CLASS_CLINIT); 803 call_class_initializer(THREAD); 804 } 805 806 // Step 9 807 if (!HAS_PENDING_EXCEPTION) { 808 set_initialization_state_and_notify(fully_initialized, CHECK); 809 { 810 debug_only(vtable().verify(tty, true);) 811 } 812 } 813 else { 814 // Step 10 and 11 815 Handle e(THREAD, PENDING_EXCEPTION); 816 CLEAR_PENDING_EXCEPTION; 817 // JVMTI has already reported the pending exception 818 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError 819 JvmtiExport::clear_detected_exception((JavaThread*)THREAD); 820 { 821 EXCEPTION_MARK; 822 set_initialization_state_and_notify(initialization_error, THREAD); 823 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below 824 // JVMTI has already reported the pending exception 825 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError 826 JvmtiExport::clear_detected_exception((JavaThread*)THREAD); 827 } 828 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait); 829 if (e->is_a(SystemDictionary::Error_klass())) { 830 THROW_OOP(e()); 831 } else { 832 JavaCallArguments args(e); 833 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(), 834 vmSymbols::throwable_void_signature(), 835 &args); 836 } 837 } 838 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait); 839 } 840 841 842 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) { 843 Handle h_init_lock(THREAD, init_lock()); 844 if (init_lock() != NULL) { 845 ObjectLocker ol(h_init_lock, THREAD); 846 set_init_state(state); 847 fence_and_clear_init_lock(); 848 ol.notify_all(CHECK); 849 } else { 850 assert(init_lock() != NULL, "The initialization state should never be set twice"); 851 set_init_state(state); 852 } 853 } 854 855 // The embedded _implementor field can only record one implementor. 856 // When there are more than one implementors, the _implementor field 857 // is set to the interface Klass* itself. Following are the possible 858 // values for the _implementor field: 859 // NULL - no implementor 860 // implementor Klass* - one implementor 861 // self - more than one implementor 862 // 863 // The _implementor field only exists for interfaces. 864 void InstanceKlass::add_implementor(Klass* k) { 865 assert(Compile_lock->owned_by_self(), ""); 866 assert(is_interface(), "not interface"); 867 // Filter out my subinterfaces. 868 // (Note: Interfaces are never on the subklass list.) 869 if (InstanceKlass::cast(k)->is_interface()) return; 870 871 // Filter out subclasses whose supers already implement me. 872 // (Note: CHA must walk subclasses of direct implementors 873 // in order to locate indirect implementors.) 874 Klass* sk = k->super(); 875 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this)) 876 // We only need to check one immediate superclass, since the 877 // implements_interface query looks at transitive_interfaces. 878 // Any supers of the super have the same (or fewer) transitive_interfaces. 879 return; 880 881 Klass* ik = implementor(); 882 if (ik == NULL) { 883 set_implementor(k); 884 } else if (ik != this) { 885 // There is already an implementor. Use itself as an indicator of 886 // more than one implementors. 887 set_implementor(this); 888 } 889 890 // The implementor also implements the transitive_interfaces 891 for (int index = 0; index < local_interfaces()->length(); index++) { 892 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k); 893 } 894 } 895 896 void InstanceKlass::init_implementor() { 897 if (is_interface()) { 898 set_implementor(NULL); 899 } 900 } 901 902 903 void InstanceKlass::process_interfaces(Thread *thread) { 904 // link this class into the implementors list of every interface it implements 905 for (int i = local_interfaces()->length() - 1; i >= 0; i--) { 906 assert(local_interfaces()->at(i)->is_klass(), "must be a klass"); 907 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i)); 908 assert(interf->is_interface(), "expected interface"); 909 interf->add_implementor(this); 910 } 911 } 912 913 bool InstanceKlass::can_be_primary_super_slow() const { 914 if (is_interface()) 915 return false; 916 else 917 return Klass::can_be_primary_super_slow(); 918 } 919 920 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots) { 921 // The secondaries are the implemented interfaces. 922 Array<Klass*>* interfaces = transitive_interfaces(); 923 int num_secondaries = num_extra_slots + interfaces->length(); 924 if (num_secondaries == 0) { 925 // Must share this for correct bootstrapping! 926 set_secondary_supers(Universe::the_empty_klass_array()); 927 return NULL; 928 } else if (num_extra_slots == 0) { 929 // The secondary super list is exactly the same as the transitive interfaces. 930 // Redefine classes has to be careful not to delete this! 931 set_secondary_supers(interfaces); 932 return NULL; 933 } else { 934 // Copy transitive interfaces to a temporary growable array to be constructed 935 // into the secondary super list with extra slots. 936 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length()); 937 for (int i = 0; i < interfaces->length(); i++) { 938 secondaries->push(interfaces->at(i)); 939 } 940 return secondaries; 941 } 942 } 943 944 bool InstanceKlass::compute_is_subtype_of(Klass* k) { 945 if (k->is_interface()) { 946 return implements_interface(k); 947 } else { 948 return Klass::compute_is_subtype_of(k); 949 } 950 } 951 952 bool InstanceKlass::implements_interface(Klass* k) const { 953 if (this == k) return true; 954 assert(k->is_interface(), "should be an interface class"); 955 for (int i = 0; i < transitive_interfaces()->length(); i++) { 956 if (transitive_interfaces()->at(i) == k) { 957 return true; 958 } 959 } 960 return false; 961 } 962 963 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const { 964 // Verify direct super interface 965 if (this == k) return true; 966 assert(k->is_interface(), "should be an interface class"); 967 for (int i = 0; i < local_interfaces()->length(); i++) { 968 if (local_interfaces()->at(i) == k) { 969 return true; 970 } 971 } 972 return false; 973 } 974 975 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) { 976 if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); 977 if (length > arrayOopDesc::max_array_length(T_OBJECT)) { 978 report_java_out_of_memory("Requested array size exceeds VM limit"); 979 JvmtiExport::post_array_size_exhausted(); 980 THROW_OOP_0(Universe::out_of_memory_error_array_size()); 981 } 982 int size = objArrayOopDesc::object_size(length); 983 Klass* ak = array_klass(n, CHECK_NULL); 984 objArrayOop o = 985 (objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_NULL); 986 return o; 987 } 988 989 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) { 990 if (TraceFinalizerRegistration) { 991 tty->print("Registered "); 992 i->print_value_on(tty); 993 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i)); 994 } 995 instanceHandle h_i(THREAD, i); 996 // Pass the handle as argument, JavaCalls::call expects oop as jobjects 997 JavaValue result(T_VOID); 998 JavaCallArguments args(h_i); 999 methodHandle mh (THREAD, Universe::finalizer_register_method()); 1000 JavaCalls::call(&result, mh, &args, CHECK_NULL); 1001 return h_i(); 1002 } 1003 1004 instanceOop InstanceKlass::allocate_instance(TRAPS) { 1005 bool has_finalizer_flag = has_finalizer(); // Query before possible GC 1006 int size = size_helper(); // Query before forming handle. 1007 1008 instanceOop i; 1009 1010 i = (instanceOop)CollectedHeap::obj_allocate(this, size, CHECK_NULL); 1011 if (has_finalizer_flag && !RegisterFinalizersAtInit) { 1012 i = register_finalizer(i, CHECK_NULL); 1013 } 1014 return i; 1015 } 1016 1017 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) { 1018 if (is_interface() || is_abstract()) { 1019 ResourceMark rm(THREAD); 1020 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() 1021 : vmSymbols::java_lang_InstantiationException(), external_name()); 1022 } 1023 if (this == SystemDictionary::Class_klass()) { 1024 ResourceMark rm(THREAD); 1025 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError() 1026 : vmSymbols::java_lang_IllegalAccessException(), external_name()); 1027 } 1028 } 1029 1030 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) { 1031 // Need load-acquire for lock-free read 1032 if (array_klasses_acquire() == NULL) { 1033 if (or_null) return NULL; 1034 1035 ResourceMark rm; 1036 JavaThread *jt = (JavaThread *)THREAD; 1037 { 1038 // Atomic creation of array_klasses 1039 MutexLocker mc(Compile_lock, THREAD); // for vtables 1040 MutexLocker ma(MultiArray_lock, THREAD); 1041 1042 // Check if update has already taken place 1043 if (array_klasses() == NULL) { 1044 Klass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL); 1045 // use 'release' to pair with lock-free load 1046 release_set_array_klasses(k); 1047 } 1048 } 1049 } 1050 // _this will always be set at this point 1051 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses(); 1052 if (or_null) { 1053 return oak->array_klass_or_null(n); 1054 } 1055 return oak->array_klass(n, THREAD); 1056 } 1057 1058 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) { 1059 return array_klass_impl(or_null, 1, THREAD); 1060 } 1061 1062 static int call_class_initializer_counter = 0; // for debugging 1063 1064 Method* InstanceKlass::class_initializer() const { 1065 Method* clinit = find_method( 1066 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature()); 1067 if (clinit != NULL && clinit->has_valid_initializer_flags()) { 1068 return clinit; 1069 } 1070 return NULL; 1071 } 1072 1073 void InstanceKlass::call_class_initializer(TRAPS) { 1074 if (ReplayCompiles && 1075 (ReplaySuppressInitializers == 1 || 1076 ReplaySuppressInitializers >= 2 && class_loader() != NULL)) { 1077 // Hide the existence of the initializer for the purpose of replaying the compile 1078 return; 1079 } 1080 1081 methodHandle h_method(THREAD, class_initializer()); 1082 assert(!is_initialized(), "we cannot initialize twice"); 1083 if (log_is_enabled(Info, class, init)) { 1084 ResourceMark rm; 1085 outputStream* log = Log(class, init)::info_stream(); 1086 log->print("%d Initializing ", call_class_initializer_counter++); 1087 name()->print_value_on(log); 1088 log->print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this)); 1089 } 1090 if (h_method() != NULL) { 1091 JavaCallArguments args; // No arguments 1092 JavaValue result(T_VOID); 1093 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args) 1094 } 1095 } 1096 1097 1098 void InstanceKlass::mask_for(const methodHandle& method, int bci, 1099 InterpreterOopMap* entry_for) { 1100 // Lazily create the _oop_map_cache at first request 1101 // Lock-free access requires load_ptr_acquire. 1102 OopMapCache* oop_map_cache = 1103 static_cast<OopMapCache*>(OrderAccess::load_ptr_acquire(&_oop_map_cache)); 1104 if (oop_map_cache == NULL) { 1105 MutexLocker x(OopMapCacheAlloc_lock); 1106 // Check if _oop_map_cache was allocated while we were waiting for this lock 1107 if ((oop_map_cache = _oop_map_cache) == NULL) { 1108 oop_map_cache = new OopMapCache(); 1109 // Ensure _oop_map_cache is stable, since it is examined without a lock 1110 OrderAccess::release_store_ptr(&_oop_map_cache, oop_map_cache); 1111 } 1112 } 1113 // _oop_map_cache is constant after init; lookup below does its own locking. 1114 oop_map_cache->lookup(method, bci, entry_for); 1115 } 1116 1117 1118 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1119 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1120 Symbol* f_name = fs.name(); 1121 Symbol* f_sig = fs.signature(); 1122 if (f_name == name && f_sig == sig) { 1123 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index()); 1124 return true; 1125 } 1126 } 1127 return false; 1128 } 1129 1130 1131 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1132 const int n = local_interfaces()->length(); 1133 for (int i = 0; i < n; i++) { 1134 Klass* intf1 = local_interfaces()->at(i); 1135 assert(intf1->is_interface(), "just checking type"); 1136 // search for field in current interface 1137 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) { 1138 assert(fd->is_static(), "interface field must be static"); 1139 return intf1; 1140 } 1141 // search for field in direct superinterfaces 1142 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd); 1143 if (intf2 != NULL) return intf2; 1144 } 1145 // otherwise field lookup fails 1146 return NULL; 1147 } 1148 1149 1150 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const { 1151 // search order according to newest JVM spec (5.4.3.2, p.167). 1152 // 1) search for field in current klass 1153 if (find_local_field(name, sig, fd)) { 1154 return const_cast<InstanceKlass*>(this); 1155 } 1156 // 2) search for field recursively in direct superinterfaces 1157 { Klass* intf = find_interface_field(name, sig, fd); 1158 if (intf != NULL) return intf; 1159 } 1160 // 3) apply field lookup recursively if superclass exists 1161 { Klass* supr = super(); 1162 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd); 1163 } 1164 // 4) otherwise field lookup fails 1165 return NULL; 1166 } 1167 1168 1169 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const { 1170 // search order according to newest JVM spec (5.4.3.2, p.167). 1171 // 1) search for field in current klass 1172 if (find_local_field(name, sig, fd)) { 1173 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this); 1174 } 1175 // 2) search for field recursively in direct superinterfaces 1176 if (is_static) { 1177 Klass* intf = find_interface_field(name, sig, fd); 1178 if (intf != NULL) return intf; 1179 } 1180 // 3) apply field lookup recursively if superclass exists 1181 { Klass* supr = super(); 1182 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd); 1183 } 1184 // 4) otherwise field lookup fails 1185 return NULL; 1186 } 1187 1188 1189 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { 1190 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1191 if (fs.offset() == offset) { 1192 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index()); 1193 if (fd->is_static() == is_static) return true; 1194 } 1195 } 1196 return false; 1197 } 1198 1199 1200 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const { 1201 Klass* klass = const_cast<InstanceKlass*>(this); 1202 while (klass != NULL) { 1203 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) { 1204 return true; 1205 } 1206 klass = klass->super(); 1207 } 1208 return false; 1209 } 1210 1211 1212 void InstanceKlass::methods_do(void f(Method* method)) { 1213 // Methods aren't stable until they are loaded. This can be read outside 1214 // a lock through the ClassLoaderData for profiling 1215 if (!is_loaded()) { 1216 return; 1217 } 1218 1219 int len = methods()->length(); 1220 for (int index = 0; index < len; index++) { 1221 Method* m = methods()->at(index); 1222 assert(m->is_method(), "must be method"); 1223 f(m); 1224 } 1225 } 1226 1227 1228 void InstanceKlass::do_local_static_fields(FieldClosure* cl) { 1229 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1230 if (fs.access_flags().is_static()) { 1231 fieldDescriptor& fd = fs.field_descriptor(); 1232 cl->do_field(&fd); 1233 } 1234 } 1235 } 1236 1237 1238 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) { 1239 for (JavaFieldStream fs(this); !fs.done(); fs.next()) { 1240 if (fs.access_flags().is_static()) { 1241 fieldDescriptor& fd = fs.field_descriptor(); 1242 f(&fd, mirror, CHECK); 1243 } 1244 } 1245 } 1246 1247 1248 static int compare_fields_by_offset(int* a, int* b) { 1249 return a[0] - b[0]; 1250 } 1251 1252 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) { 1253 InstanceKlass* super = superklass(); 1254 if (super != NULL) { 1255 super->do_nonstatic_fields(cl); 1256 } 1257 fieldDescriptor fd; 1258 int length = java_fields_count(); 1259 // In DebugInfo nonstatic fields are sorted by offset. 1260 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass); 1261 int j = 0; 1262 for (int i = 0; i < length; i += 1) { 1263 fd.reinitialize(this, i); 1264 if (!fd.is_static()) { 1265 fields_sorted[j + 0] = fd.offset(); 1266 fields_sorted[j + 1] = i; 1267 j += 2; 1268 } 1269 } 1270 if (j > 0) { 1271 length = j; 1272 // _sort_Fn is defined in growableArray.hpp. 1273 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset); 1274 for (int i = 0; i < length; i += 2) { 1275 fd.reinitialize(this, fields_sorted[i + 1]); 1276 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields"); 1277 cl->do_field(&fd); 1278 } 1279 } 1280 FREE_C_HEAP_ARRAY(int, fields_sorted); 1281 } 1282 1283 1284 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) { 1285 if (array_klasses() != NULL) 1286 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD); 1287 } 1288 1289 void InstanceKlass::array_klasses_do(void f(Klass* k)) { 1290 if (array_klasses() != NULL) 1291 ArrayKlass::cast(array_klasses())->array_klasses_do(f); 1292 } 1293 1294 #ifdef ASSERT 1295 static int linear_search(const Array<Method*>* methods, 1296 const Symbol* name, 1297 const Symbol* signature) { 1298 const int len = methods->length(); 1299 for (int index = 0; index < len; index++) { 1300 const Method* const m = methods->at(index); 1301 assert(m->is_method(), "must be method"); 1302 if (m->signature() == signature && m->name() == name) { 1303 return index; 1304 } 1305 } 1306 return -1; 1307 } 1308 #endif 1309 1310 static int binary_search(const Array<Method*>* methods, const Symbol* name) { 1311 int len = methods->length(); 1312 // methods are sorted, so do binary search 1313 int l = 0; 1314 int h = len - 1; 1315 while (l <= h) { 1316 int mid = (l + h) >> 1; 1317 Method* m = methods->at(mid); 1318 assert(m->is_method(), "must be method"); 1319 int res = m->name()->fast_compare(name); 1320 if (res == 0) { 1321 return mid; 1322 } else if (res < 0) { 1323 l = mid + 1; 1324 } else { 1325 h = mid - 1; 1326 } 1327 } 1328 return -1; 1329 } 1330 1331 // find_method looks up the name/signature in the local methods array 1332 Method* InstanceKlass::find_method(const Symbol* name, 1333 const Symbol* signature) const { 1334 return find_method_impl(name, signature, find_overpass, find_static, find_private); 1335 } 1336 1337 Method* InstanceKlass::find_method_impl(const Symbol* name, 1338 const Symbol* signature, 1339 OverpassLookupMode overpass_mode, 1340 StaticLookupMode static_mode, 1341 PrivateLookupMode private_mode) const { 1342 return InstanceKlass::find_method_impl(methods(), 1343 name, 1344 signature, 1345 overpass_mode, 1346 static_mode, 1347 private_mode); 1348 } 1349 1350 // find_instance_method looks up the name/signature in the local methods array 1351 // and skips over static methods 1352 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods, 1353 const Symbol* name, 1354 const Symbol* signature) { 1355 Method* const meth = InstanceKlass::find_method_impl(methods, 1356 name, 1357 signature, 1358 find_overpass, 1359 skip_static, 1360 find_private); 1361 assert(((meth == NULL) || !meth->is_static()), 1362 "find_instance_method should have skipped statics"); 1363 return meth; 1364 } 1365 1366 // find_instance_method looks up the name/signature in the local methods array 1367 // and skips over static methods 1368 Method* InstanceKlass::find_instance_method(const Symbol* name, const Symbol* signature) const { 1369 return InstanceKlass::find_instance_method(methods(), name, signature); 1370 } 1371 1372 // Find looks up the name/signature in the local methods array 1373 // and filters on the overpass, static and private flags 1374 // This returns the first one found 1375 // note that the local methods array can have up to one overpass, one static 1376 // and one instance (private or not) with the same name/signature 1377 Method* InstanceKlass::find_local_method(const Symbol* name, 1378 const Symbol* signature, 1379 OverpassLookupMode overpass_mode, 1380 StaticLookupMode static_mode, 1381 PrivateLookupMode private_mode) const { 1382 return InstanceKlass::find_method_impl(methods(), 1383 name, 1384 signature, 1385 overpass_mode, 1386 static_mode, 1387 private_mode); 1388 } 1389 1390 // Find looks up the name/signature in the local methods array 1391 // and filters on the overpass, static and private flags 1392 // This returns the first one found 1393 // note that the local methods array can have up to one overpass, one static 1394 // and one instance (private or not) with the same name/signature 1395 Method* InstanceKlass::find_local_method(const Array<Method*>* methods, 1396 const Symbol* name, 1397 const Symbol* signature, 1398 OverpassLookupMode overpass_mode, 1399 StaticLookupMode static_mode, 1400 PrivateLookupMode private_mode) { 1401 return InstanceKlass::find_method_impl(methods, 1402 name, 1403 signature, 1404 overpass_mode, 1405 static_mode, 1406 private_mode); 1407 } 1408 1409 Method* InstanceKlass::find_method(const Array<Method*>* methods, 1410 const Symbol* name, 1411 const Symbol* signature) { 1412 return InstanceKlass::find_method_impl(methods, 1413 name, 1414 signature, 1415 find_overpass, 1416 find_static, 1417 find_private); 1418 } 1419 1420 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods, 1421 const Symbol* name, 1422 const Symbol* signature, 1423 OverpassLookupMode overpass_mode, 1424 StaticLookupMode static_mode, 1425 PrivateLookupMode private_mode) { 1426 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode); 1427 return hit >= 0 ? methods->at(hit): NULL; 1428 } 1429 1430 // true if method matches signature and conforms to skipping_X conditions. 1431 static bool method_matches(const Method* m, 1432 const Symbol* signature, 1433 bool skipping_overpass, 1434 bool skipping_static, 1435 bool skipping_private) { 1436 return ((m->signature() == signature) && 1437 (!skipping_overpass || !m->is_overpass()) && 1438 (!skipping_static || !m->is_static()) && 1439 (!skipping_private || !m->is_private())); 1440 } 1441 1442 // Used directly for default_methods to find the index into the 1443 // default_vtable_indices, and indirectly by find_method 1444 // find_method_index looks in the local methods array to return the index 1445 // of the matching name/signature. If, overpass methods are being ignored, 1446 // the search continues to find a potential non-overpass match. This capability 1447 // is important during method resolution to prefer a static method, for example, 1448 // over an overpass method. 1449 // There is the possibility in any _method's array to have the same name/signature 1450 // for a static method, an overpass method and a local instance method 1451 // To correctly catch a given method, the search criteria may need 1452 // to explicitly skip the other two. For local instance methods, it 1453 // is often necessary to skip private methods 1454 int InstanceKlass::find_method_index(const Array<Method*>* methods, 1455 const Symbol* name, 1456 const Symbol* signature, 1457 OverpassLookupMode overpass_mode, 1458 StaticLookupMode static_mode, 1459 PrivateLookupMode private_mode) { 1460 const bool skipping_overpass = (overpass_mode == skip_overpass); 1461 const bool skipping_static = (static_mode == skip_static); 1462 const bool skipping_private = (private_mode == skip_private); 1463 const int hit = binary_search(methods, name); 1464 if (hit != -1) { 1465 const Method* const m = methods->at(hit); 1466 1467 // Do linear search to find matching signature. First, quick check 1468 // for common case, ignoring overpasses if requested. 1469 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1470 return hit; 1471 } 1472 1473 // search downwards through overloaded methods 1474 int i; 1475 for (i = hit - 1; i >= 0; --i) { 1476 const Method* const m = methods->at(i); 1477 assert(m->is_method(), "must be method"); 1478 if (m->name() != name) { 1479 break; 1480 } 1481 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1482 return i; 1483 } 1484 } 1485 // search upwards 1486 for (i = hit + 1; i < methods->length(); ++i) { 1487 const Method* const m = methods->at(i); 1488 assert(m->is_method(), "must be method"); 1489 if (m->name() != name) { 1490 break; 1491 } 1492 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) { 1493 return i; 1494 } 1495 } 1496 // not found 1497 #ifdef ASSERT 1498 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 : 1499 linear_search(methods, name, signature); 1500 assert(-1 == index, "binary search should have found entry %d", index); 1501 #endif 1502 } 1503 return -1; 1504 } 1505 1506 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const { 1507 return find_method_by_name(methods(), name, end); 1508 } 1509 1510 int InstanceKlass::find_method_by_name(const Array<Method*>* methods, 1511 const Symbol* name, 1512 int* end_ptr) { 1513 assert(end_ptr != NULL, "just checking"); 1514 int start = binary_search(methods, name); 1515 int end = start + 1; 1516 if (start != -1) { 1517 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start; 1518 while (end < methods->length() && (methods->at(end))->name() == name) ++end; 1519 *end_ptr = end; 1520 return start; 1521 } 1522 return -1; 1523 } 1524 1525 // uncached_lookup_method searches both the local class methods array and all 1526 // superclasses methods arrays, skipping any overpass methods in superclasses. 1527 Method* InstanceKlass::uncached_lookup_method(const Symbol* name, 1528 const Symbol* signature, 1529 OverpassLookupMode overpass_mode) const { 1530 OverpassLookupMode overpass_local_mode = overpass_mode; 1531 const Klass* klass = this; 1532 while (klass != NULL) { 1533 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name, 1534 signature, 1535 overpass_local_mode, 1536 find_static, 1537 find_private); 1538 if (method != NULL) { 1539 return method; 1540 } 1541 klass = klass->super(); 1542 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses 1543 } 1544 return NULL; 1545 } 1546 1547 #ifdef ASSERT 1548 // search through class hierarchy and return true if this class or 1549 // one of the superclasses was redefined 1550 bool InstanceKlass::has_redefined_this_or_super() const { 1551 const Klass* klass = this; 1552 while (klass != NULL) { 1553 if (InstanceKlass::cast(klass)->has_been_redefined()) { 1554 return true; 1555 } 1556 klass = klass->super(); 1557 } 1558 return false; 1559 } 1560 #endif 1561 1562 // lookup a method in the default methods list then in all transitive interfaces 1563 // Do NOT return private or static methods 1564 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name, 1565 Symbol* signature) const { 1566 Method* m = NULL; 1567 if (default_methods() != NULL) { 1568 m = find_method(default_methods(), name, signature); 1569 } 1570 // Look up interfaces 1571 if (m == NULL) { 1572 m = lookup_method_in_all_interfaces(name, signature, find_defaults); 1573 } 1574 return m; 1575 } 1576 1577 // lookup a method in all the interfaces that this class implements 1578 // Do NOT return private or static methods, new in JDK8 which are not externally visible 1579 // They should only be found in the initial InterfaceMethodRef 1580 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name, 1581 Symbol* signature, 1582 DefaultsLookupMode defaults_mode) const { 1583 Array<Klass*>* all_ifs = transitive_interfaces(); 1584 int num_ifs = all_ifs->length(); 1585 InstanceKlass *ik = NULL; 1586 for (int i = 0; i < num_ifs; i++) { 1587 ik = InstanceKlass::cast(all_ifs->at(i)); 1588 Method* m = ik->lookup_method(name, signature); 1589 if (m != NULL && m->is_public() && !m->is_static() && 1590 ((defaults_mode != skip_defaults) || !m->is_default_method())) { 1591 return m; 1592 } 1593 } 1594 return NULL; 1595 } 1596 1597 /* jni_id_for_impl for jfieldIds only */ 1598 JNIid* InstanceKlass::jni_id_for_impl(int offset) { 1599 MutexLocker ml(JfieldIdCreation_lock); 1600 // Retry lookup after we got the lock 1601 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); 1602 if (probe == NULL) { 1603 // Slow case, allocate new static field identifier 1604 probe = new JNIid(this, offset, jni_ids()); 1605 set_jni_ids(probe); 1606 } 1607 return probe; 1608 } 1609 1610 1611 /* jni_id_for for jfieldIds only */ 1612 JNIid* InstanceKlass::jni_id_for(int offset) { 1613 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset); 1614 if (probe == NULL) { 1615 probe = jni_id_for_impl(offset); 1616 } 1617 return probe; 1618 } 1619 1620 u2 InstanceKlass::enclosing_method_data(int offset) const { 1621 const Array<jushort>* const inner_class_list = inner_classes(); 1622 if (inner_class_list == NULL) { 1623 return 0; 1624 } 1625 const int length = inner_class_list->length(); 1626 if (length % inner_class_next_offset == 0) { 1627 return 0; 1628 } 1629 const int index = length - enclosing_method_attribute_size; 1630 assert(offset < enclosing_method_attribute_size, "invalid offset"); 1631 return inner_class_list->at(index + offset); 1632 } 1633 1634 void InstanceKlass::set_enclosing_method_indices(u2 class_index, 1635 u2 method_index) { 1636 Array<jushort>* inner_class_list = inner_classes(); 1637 assert (inner_class_list != NULL, "_inner_classes list is not set up"); 1638 int length = inner_class_list->length(); 1639 if (length % inner_class_next_offset == enclosing_method_attribute_size) { 1640 int index = length - enclosing_method_attribute_size; 1641 inner_class_list->at_put( 1642 index + enclosing_method_class_index_offset, class_index); 1643 inner_class_list->at_put( 1644 index + enclosing_method_method_index_offset, method_index); 1645 } 1646 } 1647 1648 // Lookup or create a jmethodID. 1649 // This code is called by the VMThread and JavaThreads so the 1650 // locking has to be done very carefully to avoid deadlocks 1651 // and/or other cache consistency problems. 1652 // 1653 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) { 1654 size_t idnum = (size_t)method_h->method_idnum(); 1655 jmethodID* jmeths = methods_jmethod_ids_acquire(); 1656 size_t length = 0; 1657 jmethodID id = NULL; 1658 1659 // We use a double-check locking idiom here because this cache is 1660 // performance sensitive. In the normal system, this cache only 1661 // transitions from NULL to non-NULL which is safe because we use 1662 // release_set_methods_jmethod_ids() to advertise the new cache. 1663 // A partially constructed cache should never be seen by a racing 1664 // thread. We also use release_store_ptr() to save a new jmethodID 1665 // in the cache so a partially constructed jmethodID should never be 1666 // seen either. Cache reads of existing jmethodIDs proceed without a 1667 // lock, but cache writes of a new jmethodID requires uniqueness and 1668 // creation of the cache itself requires no leaks so a lock is 1669 // generally acquired in those two cases. 1670 // 1671 // If the RedefineClasses() API has been used, then this cache can 1672 // grow and we'll have transitions from non-NULL to bigger non-NULL. 1673 // Cache creation requires no leaks and we require safety between all 1674 // cache accesses and freeing of the old cache so a lock is generally 1675 // acquired when the RedefineClasses() API has been used. 1676 1677 if (jmeths != NULL) { 1678 // the cache already exists 1679 if (!idnum_can_increment()) { 1680 // the cache can't grow so we can just get the current values 1681 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1682 } else { 1683 // cache can grow so we have to be more careful 1684 if (Threads::number_of_threads() == 0 || 1685 SafepointSynchronize::is_at_safepoint()) { 1686 // we're single threaded or at a safepoint - no locking needed 1687 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1688 } else { 1689 MutexLocker ml(JmethodIdCreation_lock); 1690 get_jmethod_id_length_value(jmeths, idnum, &length, &id); 1691 } 1692 } 1693 } 1694 // implied else: 1695 // we need to allocate a cache so default length and id values are good 1696 1697 if (jmeths == NULL || // no cache yet 1698 length <= idnum || // cache is too short 1699 id == NULL) { // cache doesn't contain entry 1700 1701 // This function can be called by the VMThread so we have to do all 1702 // things that might block on a safepoint before grabbing the lock. 1703 // Otherwise, we can deadlock with the VMThread or have a cache 1704 // consistency issue. These vars keep track of what we might have 1705 // to free after the lock is dropped. 1706 jmethodID to_dealloc_id = NULL; 1707 jmethodID* to_dealloc_jmeths = NULL; 1708 1709 // may not allocate new_jmeths or use it if we allocate it 1710 jmethodID* new_jmeths = NULL; 1711 if (length <= idnum) { 1712 // allocate a new cache that might be used 1713 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count()); 1714 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass); 1715 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID)); 1716 // cache size is stored in element[0], other elements offset by one 1717 new_jmeths[0] = (jmethodID)size; 1718 } 1719 1720 // allocate a new jmethodID that might be used 1721 jmethodID new_id = NULL; 1722 if (method_h->is_old() && !method_h->is_obsolete()) { 1723 // The method passed in is old (but not obsolete), we need to use the current version 1724 Method* current_method = method_with_idnum((int)idnum); 1725 assert(current_method != NULL, "old and but not obsolete, so should exist"); 1726 new_id = Method::make_jmethod_id(class_loader_data(), current_method); 1727 } else { 1728 // It is the current version of the method or an obsolete method, 1729 // use the version passed in 1730 new_id = Method::make_jmethod_id(class_loader_data(), method_h()); 1731 } 1732 1733 if (Threads::number_of_threads() == 0 || 1734 SafepointSynchronize::is_at_safepoint()) { 1735 // we're single threaded or at a safepoint - no locking needed 1736 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths, 1737 &to_dealloc_id, &to_dealloc_jmeths); 1738 } else { 1739 MutexLocker ml(JmethodIdCreation_lock); 1740 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths, 1741 &to_dealloc_id, &to_dealloc_jmeths); 1742 } 1743 1744 // The lock has been dropped so we can free resources. 1745 // Free up either the old cache or the new cache if we allocated one. 1746 if (to_dealloc_jmeths != NULL) { 1747 FreeHeap(to_dealloc_jmeths); 1748 } 1749 // free up the new ID since it wasn't needed 1750 if (to_dealloc_id != NULL) { 1751 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id); 1752 } 1753 } 1754 return id; 1755 } 1756 1757 // Figure out how many jmethodIDs haven't been allocated, and make 1758 // sure space for them is pre-allocated. This makes getting all 1759 // method ids much, much faster with classes with more than 8 1760 // methods, and has a *substantial* effect on performance with jvmti 1761 // code that loads all jmethodIDs for all classes. 1762 void InstanceKlass::ensure_space_for_methodids(int start_offset) { 1763 int new_jmeths = 0; 1764 int length = methods()->length(); 1765 for (int index = start_offset; index < length; index++) { 1766 Method* m = methods()->at(index); 1767 jmethodID id = m->find_jmethod_id_or_null(); 1768 if (id == NULL) { 1769 new_jmeths++; 1770 } 1771 } 1772 if (new_jmeths != 0) { 1773 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths); 1774 } 1775 } 1776 1777 // Common code to fetch the jmethodID from the cache or update the 1778 // cache with the new jmethodID. This function should never do anything 1779 // that causes the caller to go to a safepoint or we can deadlock with 1780 // the VMThread or have cache consistency issues. 1781 // 1782 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update( 1783 size_t idnum, jmethodID new_id, 1784 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p, 1785 jmethodID** to_dealloc_jmeths_p) { 1786 assert(new_id != NULL, "sanity check"); 1787 assert(to_dealloc_id_p != NULL, "sanity check"); 1788 assert(to_dealloc_jmeths_p != NULL, "sanity check"); 1789 assert(Threads::number_of_threads() == 0 || 1790 SafepointSynchronize::is_at_safepoint() || 1791 JmethodIdCreation_lock->owned_by_self(), "sanity check"); 1792 1793 // reacquire the cache - we are locked, single threaded or at a safepoint 1794 jmethodID* jmeths = methods_jmethod_ids_acquire(); 1795 jmethodID id = NULL; 1796 size_t length = 0; 1797 1798 if (jmeths == NULL || // no cache yet 1799 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short 1800 if (jmeths != NULL) { 1801 // copy any existing entries from the old cache 1802 for (size_t index = 0; index < length; index++) { 1803 new_jmeths[index+1] = jmeths[index+1]; 1804 } 1805 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete 1806 } 1807 release_set_methods_jmethod_ids(jmeths = new_jmeths); 1808 } else { 1809 // fetch jmethodID (if any) from the existing cache 1810 id = jmeths[idnum+1]; 1811 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete 1812 } 1813 if (id == NULL) { 1814 // No matching jmethodID in the existing cache or we have a new 1815 // cache or we just grew the cache. This cache write is done here 1816 // by the first thread to win the foot race because a jmethodID 1817 // needs to be unique once it is generally available. 1818 id = new_id; 1819 1820 // The jmethodID cache can be read while unlocked so we have to 1821 // make sure the new jmethodID is complete before installing it 1822 // in the cache. 1823 OrderAccess::release_store_ptr(&jmeths[idnum+1], id); 1824 } else { 1825 *to_dealloc_id_p = new_id; // save new id for later delete 1826 } 1827 return id; 1828 } 1829 1830 1831 // Common code to get the jmethodID cache length and the jmethodID 1832 // value at index idnum if there is one. 1833 // 1834 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache, 1835 size_t idnum, size_t *length_p, jmethodID* id_p) { 1836 assert(cache != NULL, "sanity check"); 1837 assert(length_p != NULL, "sanity check"); 1838 assert(id_p != NULL, "sanity check"); 1839 1840 // cache size is stored in element[0], other elements offset by one 1841 *length_p = (size_t)cache[0]; 1842 if (*length_p <= idnum) { // cache is too short 1843 *id_p = NULL; 1844 } else { 1845 *id_p = cache[idnum+1]; // fetch jmethodID (if any) 1846 } 1847 } 1848 1849 1850 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles 1851 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) { 1852 size_t idnum = (size_t)method->method_idnum(); 1853 jmethodID* jmeths = methods_jmethod_ids_acquire(); 1854 size_t length; // length assigned as debugging crumb 1855 jmethodID id = NULL; 1856 if (jmeths != NULL && // If there is a cache 1857 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough, 1858 id = jmeths[idnum+1]; // Look up the id (may be NULL) 1859 } 1860 return id; 1861 } 1862 1863 inline DependencyContext InstanceKlass::dependencies() { 1864 DependencyContext dep_context(&_dep_context); 1865 return dep_context; 1866 } 1867 1868 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) { 1869 return dependencies().mark_dependent_nmethods(changes); 1870 } 1871 1872 void InstanceKlass::add_dependent_nmethod(nmethod* nm) { 1873 dependencies().add_dependent_nmethod(nm); 1874 } 1875 1876 void InstanceKlass::remove_dependent_nmethod(nmethod* nm, bool delete_immediately) { 1877 dependencies().remove_dependent_nmethod(nm, delete_immediately); 1878 } 1879 1880 #ifndef PRODUCT 1881 void InstanceKlass::print_dependent_nmethods(bool verbose) { 1882 dependencies().print_dependent_nmethods(verbose); 1883 } 1884 1885 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) { 1886 return dependencies().is_dependent_nmethod(nm); 1887 } 1888 #endif //PRODUCT 1889 1890 oop* InstanceKlass::klass_holder_addr() const { 1891 return is_anonymous() ? const_cast<oop*>(&_java_mirror) : _class_loader_data->class_loader_addr(); 1892 } 1893 1894 void InstanceKlass::clean_weak_instanceklass_links(BoolObjectClosure* is_alive) { 1895 clean_implementors_list(is_alive); 1896 clean_method_data(is_alive); 1897 1898 // Since GC iterates InstanceKlasses sequentially, it is safe to remove stale entries here. 1899 DependencyContext dep_context(&_dep_context); 1900 dep_context.expunge_stale_entries(); 1901 } 1902 1903 void InstanceKlass::clean_implementors_list(BoolObjectClosure* is_alive) { 1904 assert(class_loader_data()->is_alive(is_alive), "this klass should be live"); 1905 if (is_interface()) { 1906 if (ClassUnloading) { 1907 Klass* impl = implementor(); 1908 if (impl != NULL) { 1909 if (!impl->is_loader_alive(is_alive)) { 1910 // remove this guy 1911 Klass** klass = adr_implementor(); 1912 assert(klass != NULL, "null klass"); 1913 if (klass != NULL) { 1914 *klass = NULL; 1915 } 1916 } 1917 } 1918 } 1919 } 1920 } 1921 1922 void InstanceKlass::clean_method_data(BoolObjectClosure* is_alive) { 1923 for (int m = 0; m < methods()->length(); m++) { 1924 MethodData* mdo = methods()->at(m)->method_data(); 1925 if (mdo != NULL) { 1926 mdo->clean_method_data(is_alive); 1927 } 1928 } 1929 } 1930 1931 bool InstanceKlass::supers_have_passed_fingerprint_checks() { 1932 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) { 1933 ResourceMark rm; 1934 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name()); 1935 return false; 1936 } 1937 1938 Array<Klass*>* local_interfaces = this->local_interfaces(); 1939 if (local_interfaces != NULL) { 1940 int length = local_interfaces->length(); 1941 for (int i = 0; i < length; i++) { 1942 InstanceKlass* intf = InstanceKlass::cast(local_interfaces->at(i)); 1943 if (!intf->has_passed_fingerprint_check()) { 1944 ResourceMark rm; 1945 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name()); 1946 return false; 1947 } 1948 } 1949 } 1950 1951 return true; 1952 } 1953 1954 bool InstanceKlass::should_store_fingerprint() { 1955 #if INCLUDE_AOT 1956 // We store the fingerprint into the InstanceKlass only in the following 2 cases: 1957 if (EnableJVMCI && !UseJVMCICompiler) { 1958 // (1) We are running AOT to generate a shared library. 1959 return true; 1960 } 1961 if (DumpSharedSpaces) { 1962 // (2) We are running -Xshare:dump to create a shared archive 1963 return true; 1964 } 1965 #endif 1966 1967 // In all other cases we might set the _misc_has_passed_fingerprint_check bit, 1968 // but do not store the 64-bit fingerprint to save space. 1969 return false; 1970 } 1971 1972 bool InstanceKlass::has_stored_fingerprint() const { 1973 #if INCLUDE_AOT 1974 return should_store_fingerprint() || is_shared(); 1975 #else 1976 return false; 1977 #endif 1978 } 1979 1980 uint64_t InstanceKlass::get_stored_fingerprint() const { 1981 address adr = adr_fingerprint(); 1982 if (adr != NULL) { 1983 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned 1984 } 1985 return 0; 1986 } 1987 1988 void InstanceKlass::store_fingerprint(uint64_t fingerprint) { 1989 address adr = adr_fingerprint(); 1990 if (adr != NULL) { 1991 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned 1992 1993 ResourceMark rm; 1994 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name()); 1995 } 1996 } 1997 1998 static void remove_unshareable_in_class(Klass* k) { 1999 // remove klass's unshareable info 2000 k->remove_unshareable_info(); 2001 } 2002 2003 void InstanceKlass::remove_unshareable_info() { 2004 Klass::remove_unshareable_info(); 2005 // Unlink the class 2006 if (is_linked()) { 2007 unlink_class(); 2008 } 2009 init_implementor(); 2010 2011 constants()->remove_unshareable_info(); 2012 2013 assert(_dep_context == DependencyContext::EMPTY, "dependency context is not shareable"); 2014 2015 for (int i = 0; i < methods()->length(); i++) { 2016 Method* m = methods()->at(i); 2017 m->remove_unshareable_info(); 2018 } 2019 2020 // do array classes also. 2021 array_klasses_do(remove_unshareable_in_class); 2022 } 2023 2024 static void restore_unshareable_in_class(Klass* k, TRAPS) { 2025 // Array classes have null protection domain. 2026 // --> see ArrayKlass::complete_create_array_klass() 2027 k->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK); 2028 } 2029 2030 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) { 2031 set_package(loader_data, CHECK); 2032 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK); 2033 2034 Array<Method*>* methods = this->methods(); 2035 int num_methods = methods->length(); 2036 for (int index2 = 0; index2 < num_methods; ++index2) { 2037 methodHandle m(THREAD, methods->at(index2)); 2038 m->restore_unshareable_info(CHECK); 2039 } 2040 if (JvmtiExport::has_redefined_a_class()) { 2041 // Reinitialize vtable because RedefineClasses may have changed some 2042 // entries in this vtable for super classes so the CDS vtable might 2043 // point to old or obsolete entries. RedefineClasses doesn't fix up 2044 // vtables in the shared system dictionary, only the main one. 2045 // It also redefines the itable too so fix that too. 2046 ResourceMark rm(THREAD); 2047 vtable().initialize_vtable(false, CHECK); 2048 itable().initialize_itable(false, CHECK); 2049 } 2050 2051 // restore constant pool resolved references 2052 constants()->restore_unshareable_info(CHECK); 2053 2054 array_klasses_do(restore_unshareable_in_class, CHECK); 2055 } 2056 2057 // returns true IFF is_in_error_state() has been changed as a result of this call. 2058 bool InstanceKlass::check_sharing_error_state() { 2059 assert(DumpSharedSpaces, "should only be called during dumping"); 2060 bool old_state = is_in_error_state(); 2061 2062 if (!is_in_error_state()) { 2063 bool bad = false; 2064 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) { 2065 if (sup->is_in_error_state()) { 2066 bad = true; 2067 break; 2068 } 2069 } 2070 if (!bad) { 2071 Array<Klass*>* interfaces = transitive_interfaces(); 2072 for (int i = 0; i < interfaces->length(); i++) { 2073 Klass* iface = interfaces->at(i); 2074 if (InstanceKlass::cast(iface)->is_in_error_state()) { 2075 bad = true; 2076 break; 2077 } 2078 } 2079 } 2080 2081 if (bad) { 2082 set_in_error_state(); 2083 } 2084 } 2085 2086 return (old_state != is_in_error_state()); 2087 } 2088 2089 #if INCLUDE_JVMTI 2090 static void clear_all_breakpoints(Method* m) { 2091 m->clear_all_breakpoints(); 2092 } 2093 #endif 2094 2095 void InstanceKlass::notify_unload_class(InstanceKlass* ik) { 2096 // notify the debugger 2097 if (JvmtiExport::should_post_class_unload()) { 2098 JvmtiExport::post_class_unload(ik); 2099 } 2100 2101 // notify ClassLoadingService of class unload 2102 ClassLoadingService::notify_class_unloaded(ik); 2103 } 2104 2105 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) { 2106 // Clean up C heap 2107 ik->release_C_heap_structures(); 2108 ik->constants()->release_C_heap_structures(); 2109 } 2110 2111 void InstanceKlass::release_C_heap_structures() { 2112 // Can't release the constant pool here because the constant pool can be 2113 // deallocated separately from the InstanceKlass for default methods and 2114 // redefine classes. 2115 2116 // Deallocate oop map cache 2117 if (_oop_map_cache != NULL) { 2118 delete _oop_map_cache; 2119 _oop_map_cache = NULL; 2120 } 2121 2122 // Deallocate JNI identifiers for jfieldIDs 2123 JNIid::deallocate(jni_ids()); 2124 set_jni_ids(NULL); 2125 2126 jmethodID* jmeths = methods_jmethod_ids_acquire(); 2127 if (jmeths != (jmethodID*)NULL) { 2128 release_set_methods_jmethod_ids(NULL); 2129 FreeHeap(jmeths); 2130 } 2131 2132 // Deallocate MemberNameTable 2133 { 2134 Mutex* lock_or_null = SafepointSynchronize::is_at_safepoint() ? NULL : MemberNameTable_lock; 2135 MutexLockerEx ml(lock_or_null, Mutex::_no_safepoint_check_flag); 2136 MemberNameTable* mnt = member_names(); 2137 if (mnt != NULL) { 2138 delete mnt; 2139 set_member_names(NULL); 2140 } 2141 } 2142 2143 // Release dependencies. 2144 // It is desirable to use DC::remove_all_dependents() here, but, unfortunately, 2145 // it is not safe (see JDK-8143408). The problem is that the klass dependency 2146 // context can contain live dependencies, since there's a race between nmethod & 2147 // klass unloading. If the klass is dead when nmethod unloading happens, relevant 2148 // dependencies aren't removed from the context associated with the class (see 2149 // nmethod::flush_dependencies). It ends up during klass unloading as seemingly 2150 // live dependencies pointing to unloaded nmethods and causes a crash in 2151 // DC::remove_all_dependents() when it touches unloaded nmethod. 2152 dependencies().wipe(); 2153 2154 #if INCLUDE_JVMTI 2155 // Deallocate breakpoint records 2156 if (breakpoints() != 0x0) { 2157 methods_do(clear_all_breakpoints); 2158 assert(breakpoints() == 0x0, "should have cleared breakpoints"); 2159 } 2160 2161 // deallocate the cached class file 2162 if (_cached_class_file != NULL && !MetaspaceShared::is_in_shared_space(_cached_class_file)) { 2163 os::free(_cached_class_file); 2164 _cached_class_file = NULL; 2165 } 2166 #endif 2167 2168 // Decrement symbol reference counts associated with the unloaded class. 2169 if (_name != NULL) _name->decrement_refcount(); 2170 // unreference array name derived from this class name (arrays of an unloaded 2171 // class can't be referenced anymore). 2172 if (_array_name != NULL) _array_name->decrement_refcount(); 2173 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension); 2174 2175 assert(_total_instanceKlass_count >= 1, "Sanity check"); 2176 Atomic::dec(&_total_instanceKlass_count); 2177 } 2178 2179 void InstanceKlass::set_source_debug_extension(const char* array, int length) { 2180 if (array == NULL) { 2181 _source_debug_extension = NULL; 2182 } else { 2183 // Adding one to the attribute length in order to store a null terminator 2184 // character could cause an overflow because the attribute length is 2185 // already coded with an u4 in the classfile, but in practice, it's 2186 // unlikely to happen. 2187 assert((length+1) > length, "Overflow checking"); 2188 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass); 2189 for (int i = 0; i < length; i++) { 2190 sde[i] = array[i]; 2191 } 2192 sde[length] = '\0'; 2193 _source_debug_extension = sde; 2194 } 2195 } 2196 2197 address InstanceKlass::static_field_addr(int offset) { 2198 return (address)(offset + InstanceMirrorKlass::offset_of_static_fields() + cast_from_oop<intptr_t>(java_mirror())); 2199 } 2200 2201 2202 const char* InstanceKlass::signature_name() const { 2203 int hash_len = 0; 2204 char hash_buf[40]; 2205 2206 // If this is an anonymous class, append a hash to make the name unique 2207 if (is_anonymous()) { 2208 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0; 2209 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash); 2210 hash_len = (int)strlen(hash_buf); 2211 } 2212 2213 // Get the internal name as a c string 2214 const char* src = (const char*) (name()->as_C_string()); 2215 const int src_length = (int)strlen(src); 2216 2217 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3); 2218 2219 // Add L as type indicator 2220 int dest_index = 0; 2221 dest[dest_index++] = 'L'; 2222 2223 // Add the actual class name 2224 for (int src_index = 0; src_index < src_length; ) { 2225 dest[dest_index++] = src[src_index++]; 2226 } 2227 2228 // If we have a hash, append it 2229 for (int hash_index = 0; hash_index < hash_len; ) { 2230 dest[dest_index++] = hash_buf[hash_index++]; 2231 } 2232 2233 // Add the semicolon and the NULL 2234 dest[dest_index++] = ';'; 2235 dest[dest_index] = '\0'; 2236 return dest; 2237 } 2238 2239 // Used to obtain the package name from a fully qualified class name. 2240 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) { 2241 if (name == NULL) { 2242 return NULL; 2243 } else { 2244 if (name->utf8_length() <= 0) { 2245 return NULL; 2246 } 2247 ResourceMark rm; 2248 const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string()); 2249 if (package_name == NULL) { 2250 return NULL; 2251 } 2252 Symbol* pkg_name = SymbolTable::new_symbol(package_name, THREAD); 2253 return pkg_name; 2254 } 2255 } 2256 2257 ModuleEntry* InstanceKlass::module() const { 2258 if (!in_unnamed_package()) { 2259 return _package_entry->module(); 2260 } 2261 const Klass* host = host_klass(); 2262 if (host == NULL) { 2263 return class_loader_data()->unnamed_module(); 2264 } 2265 return host->class_loader_data()->unnamed_module(); 2266 } 2267 2268 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) { 2269 2270 // ensure java/ packages only loaded by boot or platform builtin loaders 2271 Handle class_loader(THREAD, loader_data->class_loader()); 2272 check_prohibited_package(name(), class_loader, CHECK); 2273 2274 TempNewSymbol pkg_name = package_from_name(name(), CHECK); 2275 2276 if (pkg_name != NULL && loader_data != NULL) { 2277 2278 // Find in class loader's package entry table. 2279 _package_entry = loader_data->packages()->lookup_only(pkg_name); 2280 2281 // If the package name is not found in the loader's package 2282 // entry table, it is an indication that the package has not 2283 // been defined. Consider it defined within the unnamed module. 2284 if (_package_entry == NULL) { 2285 ResourceMark rm; 2286 2287 if (!ModuleEntryTable::javabase_defined()) { 2288 // Before java.base is defined during bootstrapping, define all packages in 2289 // the java.base module. If a non-java.base package is erroneously placed 2290 // in the java.base module it will be caught later when java.base 2291 // is defined by ModuleEntryTable::verify_javabase_packages check. 2292 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL"); 2293 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry()); 2294 } else { 2295 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL"); 2296 _package_entry = loader_data->packages()->lookup(pkg_name, 2297 loader_data->unnamed_module()); 2298 } 2299 2300 // A package should have been successfully created 2301 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s", 2302 name()->as_C_string(), loader_data->loader_name()); 2303 } 2304 2305 if (log_is_enabled(Debug, modules)) { 2306 ResourceMark rm; 2307 ModuleEntry* m = _package_entry->module(); 2308 log_trace(modules)("Setting package: class: %s, package: %s, loader: %s, module: %s", 2309 external_name(), 2310 pkg_name->as_C_string(), 2311 loader_data->loader_name(), 2312 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE)); 2313 } 2314 } else { 2315 ResourceMark rm; 2316 log_trace(modules)("Setting package: class: %s, package: unnamed, loader: %s, module: %s", 2317 external_name(), 2318 (loader_data != NULL) ? loader_data->loader_name() : "NULL", 2319 UNNAMED_MODULE); 2320 } 2321 } 2322 2323 2324 // different versions of is_same_class_package 2325 2326 bool InstanceKlass::is_same_class_package(const Klass* class2) const { 2327 oop classloader1 = this->class_loader(); 2328 PackageEntry* classpkg1 = this->package(); 2329 if (class2->is_objArray_klass()) { 2330 class2 = ObjArrayKlass::cast(class2)->bottom_klass(); 2331 } 2332 2333 oop classloader2; 2334 PackageEntry* classpkg2; 2335 if (class2->is_instance_klass()) { 2336 classloader2 = class2->class_loader(); 2337 classpkg2 = class2->package(); 2338 } else { 2339 assert(class2->is_typeArray_klass(), "should be type array"); 2340 classloader2 = NULL; 2341 classpkg2 = NULL; 2342 } 2343 2344 // Same package is determined by comparing class loader 2345 // and package entries. Both must be the same. This rule 2346 // applies even to classes that are defined in the unnamed 2347 // package, they still must have the same class loader. 2348 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) { 2349 return true; 2350 } 2351 2352 return false; 2353 } 2354 2355 bool InstanceKlass::is_same_class_package(oop other_class_loader, 2356 const Symbol* other_class_name) const { 2357 oop this_class_loader = class_loader(); 2358 const Symbol* const this_class_name = name(); 2359 2360 return InstanceKlass::is_same_class_package(this_class_loader, 2361 this_class_name, 2362 other_class_loader, 2363 other_class_name); 2364 } 2365 2366 // return true if two classes are in the same package, classloader 2367 // and classname information is enough to determine a class's package 2368 bool InstanceKlass::is_same_class_package(oop class_loader1, const Symbol* class_name1, 2369 oop class_loader2, const Symbol* class_name2) { 2370 if (class_loader1 != class_loader2) { 2371 return false; 2372 } else if (class_name1 == class_name2) { 2373 return true; 2374 } else { 2375 ResourceMark rm; 2376 2377 bool bad_class_name = false; 2378 const char* name1 = ClassLoader::package_from_name((const char*) class_name1->as_C_string(), &bad_class_name); 2379 if (bad_class_name) { 2380 return false; 2381 } 2382 2383 const char* name2 = ClassLoader::package_from_name((const char*) class_name2->as_C_string(), &bad_class_name); 2384 if (bad_class_name) { 2385 return false; 2386 } 2387 2388 if ((name1 == NULL) || (name2 == NULL)) { 2389 // One of the two doesn't have a package. Only return true 2390 // if the other one also doesn't have a package. 2391 return name1 == name2; 2392 } 2393 2394 // Check that package is identical 2395 return (strcmp(name1, name2) == 0); 2396 } 2397 } 2398 2399 // Returns true iff super_method can be overridden by a method in targetclassname 2400 // See JLS 3rd edition 8.4.6.1 2401 // Assumes name-signature match 2402 // "this" is InstanceKlass of super_method which must exist 2403 // note that the InstanceKlass of the method in the targetclassname has not always been created yet 2404 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) { 2405 // Private methods can not be overridden 2406 if (super_method->is_private()) { 2407 return false; 2408 } 2409 // If super method is accessible, then override 2410 if ((super_method->is_protected()) || 2411 (super_method->is_public())) { 2412 return true; 2413 } 2414 // Package-private methods are not inherited outside of package 2415 assert(super_method->is_package_private(), "must be package private"); 2416 return(is_same_class_package(targetclassloader(), targetclassname)); 2417 } 2418 2419 // Only boot and platform class loaders can define classes in "java/" packages. 2420 void InstanceKlass::check_prohibited_package(Symbol* class_name, 2421 Handle class_loader, 2422 TRAPS) { 2423 if (!class_loader.is_null() && 2424 !SystemDictionary::is_platform_class_loader(class_loader()) && 2425 class_name != NULL) { 2426 ResourceMark rm(THREAD); 2427 char* name = class_name->as_C_string(); 2428 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') { 2429 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK); 2430 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'"); 2431 name = pkg_name->as_C_string(); 2432 const char* class_loader_name = SystemDictionary::loader_name(class_loader()); 2433 StringUtils::replace_no_expand(name, "/", "."); 2434 const char* msg_text1 = "Class loader (instance of): "; 2435 const char* msg_text2 = " tried to load prohibited package name: "; 2436 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1; 2437 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); 2438 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name); 2439 THROW_MSG(vmSymbols::java_lang_SecurityException(), message); 2440 } 2441 } 2442 return; 2443 } 2444 2445 // tell if two classes have the same enclosing class (at package level) 2446 bool InstanceKlass::is_same_package_member(const Klass* class2, TRAPS) const { 2447 if (class2 == this) return true; 2448 if (!class2->is_instance_klass()) return false; 2449 2450 // must be in same package before we try anything else 2451 if (!is_same_class_package(class2)) 2452 return false; 2453 2454 // As long as there is an outer_this.getEnclosingClass, 2455 // shift the search outward. 2456 const InstanceKlass* outer_this = this; 2457 for (;;) { 2458 // As we walk along, look for equalities between outer_this and class2. 2459 // Eventually, the walks will terminate as outer_this stops 2460 // at the top-level class around the original class. 2461 bool ignore_inner_is_member; 2462 const Klass* next = outer_this->compute_enclosing_class(&ignore_inner_is_member, 2463 CHECK_false); 2464 if (next == NULL) break; 2465 if (next == class2) return true; 2466 outer_this = InstanceKlass::cast(next); 2467 } 2468 2469 // Now do the same for class2. 2470 const InstanceKlass* outer2 = InstanceKlass::cast(class2); 2471 for (;;) { 2472 bool ignore_inner_is_member; 2473 Klass* next = outer2->compute_enclosing_class(&ignore_inner_is_member, 2474 CHECK_false); 2475 if (next == NULL) break; 2476 // Might as well check the new outer against all available values. 2477 if (next == this) return true; 2478 if (next == outer_this) return true; 2479 outer2 = InstanceKlass::cast(next); 2480 } 2481 2482 // If by this point we have not found an equality between the 2483 // two classes, we know they are in separate package members. 2484 return false; 2485 } 2486 2487 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const { 2488 constantPoolHandle i_cp(THREAD, constants()); 2489 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) { 2490 int ioff = iter.inner_class_info_index(); 2491 if (ioff != 0) { 2492 // Check to see if the name matches the class we're looking for 2493 // before attempting to find the class. 2494 if (i_cp->klass_name_at_matches(this, ioff)) { 2495 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false); 2496 if (this == inner_klass) { 2497 *ooff = iter.outer_class_info_index(); 2498 *noff = iter.inner_name_index(); 2499 return true; 2500 } 2501 } 2502 } 2503 } 2504 return false; 2505 } 2506 2507 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const { 2508 InstanceKlass* outer_klass = NULL; 2509 *inner_is_member = false; 2510 int ooff = 0, noff = 0; 2511 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD); 2512 if (has_inner_classes_attr) { 2513 constantPoolHandle i_cp(THREAD, constants()); 2514 if (ooff != 0) { 2515 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL); 2516 outer_klass = InstanceKlass::cast(ok); 2517 *inner_is_member = true; 2518 } 2519 if (NULL == outer_klass) { 2520 // It may be anonymous; try for that. 2521 int encl_method_class_idx = enclosing_method_class_index(); 2522 if (encl_method_class_idx != 0) { 2523 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL); 2524 outer_klass = InstanceKlass::cast(ok); 2525 *inner_is_member = false; 2526 } 2527 } 2528 } 2529 2530 // If no inner class attribute found for this class. 2531 if (NULL == outer_klass) return NULL; 2532 2533 // Throws an exception if outer klass has not declared k as an inner klass 2534 // We need evidence that each klass knows about the other, or else 2535 // the system could allow a spoof of an inner class to gain access rights. 2536 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL); 2537 return outer_klass; 2538 } 2539 2540 jint InstanceKlass::compute_modifier_flags(TRAPS) const { 2541 jint access = access_flags().as_int(); 2542 2543 // But check if it happens to be member class. 2544 InnerClassesIterator iter(this); 2545 for (; !iter.done(); iter.next()) { 2546 int ioff = iter.inner_class_info_index(); 2547 // Inner class attribute can be zero, skip it. 2548 // Strange but true: JVM spec. allows null inner class refs. 2549 if (ioff == 0) continue; 2550 2551 // only look at classes that are already loaded 2552 // since we are looking for the flags for our self. 2553 Symbol* inner_name = constants()->klass_name_at(ioff); 2554 if (name() == inner_name) { 2555 // This is really a member class. 2556 access = iter.inner_access_flags(); 2557 break; 2558 } 2559 } 2560 // Remember to strip ACC_SUPER bit 2561 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS; 2562 } 2563 2564 jint InstanceKlass::jvmti_class_status() const { 2565 jint result = 0; 2566 2567 if (is_linked()) { 2568 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED; 2569 } 2570 2571 if (is_initialized()) { 2572 assert(is_linked(), "Class status is not consistent"); 2573 result |= JVMTI_CLASS_STATUS_INITIALIZED; 2574 } 2575 if (is_in_error_state()) { 2576 result |= JVMTI_CLASS_STATUS_ERROR; 2577 } 2578 return result; 2579 } 2580 2581 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) { 2582 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable(); 2583 int method_table_offset_in_words = ioe->offset()/wordSize; 2584 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words()) 2585 / itableOffsetEntry::size(); 2586 2587 for (int cnt = 0 ; ; cnt ++, ioe ++) { 2588 // If the interface isn't implemented by the receiver class, 2589 // the VM should throw IncompatibleClassChangeError. 2590 if (cnt >= nof_interfaces) { 2591 THROW_NULL(vmSymbols::java_lang_IncompatibleClassChangeError()); 2592 } 2593 2594 Klass* ik = ioe->interface_klass(); 2595 if (ik == holder) break; 2596 } 2597 2598 itableMethodEntry* ime = ioe->first_method_entry(this); 2599 Method* m = ime[index].method(); 2600 if (m == NULL) { 2601 THROW_NULL(vmSymbols::java_lang_AbstractMethodError()); 2602 } 2603 return m; 2604 } 2605 2606 2607 #if INCLUDE_JVMTI 2608 // update default_methods for redefineclasses for methods that are 2609 // not yet in the vtable due to concurrent subclass define and superinterface 2610 // redefinition 2611 // Note: those in the vtable, should have been updated via adjust_method_entries 2612 void InstanceKlass::adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed) { 2613 // search the default_methods for uses of either obsolete or EMCP methods 2614 if (default_methods() != NULL) { 2615 for (int index = 0; index < default_methods()->length(); index ++) { 2616 Method* old_method = default_methods()->at(index); 2617 if (old_method == NULL || old_method->method_holder() != holder || !old_method->is_old()) { 2618 continue; // skip uninteresting entries 2619 } 2620 assert(!old_method->is_deleted(), "default methods may not be deleted"); 2621 2622 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 2623 2624 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 2625 assert(old_method != new_method, "sanity check"); 2626 2627 default_methods()->at_put(index, new_method); 2628 if (log_is_enabled(Info, redefine, class, update)) { 2629 ResourceMark rm; 2630 if (!(*trace_name_printed)) { 2631 log_info(redefine, class, update) 2632 ("adjust: klassname=%s default methods from name=%s", 2633 external_name(), old_method->method_holder()->external_name()); 2634 *trace_name_printed = true; 2635 } 2636 log_debug(redefine, class, update, vtables) 2637 ("default method update: %s(%s) ", 2638 new_method->name()->as_C_string(), new_method->signature()->as_C_string()); 2639 } 2640 } 2641 } 2642 } 2643 #endif // INCLUDE_JVMTI 2644 2645 // On-stack replacement stuff 2646 void InstanceKlass::add_osr_nmethod(nmethod* n) { 2647 // only one compilation can be active 2648 { 2649 // This is a short non-blocking critical region, so the no safepoint check is ok. 2650 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag); 2651 assert(n->is_osr_method(), "wrong kind of nmethod"); 2652 n->set_osr_link(osr_nmethods_head()); 2653 set_osr_nmethods_head(n); 2654 // Raise the highest osr level if necessary 2655 if (TieredCompilation) { 2656 Method* m = n->method(); 2657 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level())); 2658 } 2659 } 2660 2661 // Get rid of the osr methods for the same bci that have lower levels. 2662 if (TieredCompilation) { 2663 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) { 2664 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true); 2665 if (inv != NULL && inv->is_in_use()) { 2666 inv->make_not_entrant(); 2667 } 2668 } 2669 } 2670 } 2671 2672 // Remove osr nmethod from the list. Return true if found and removed. 2673 bool InstanceKlass::remove_osr_nmethod(nmethod* n) { 2674 // This is a short non-blocking critical region, so the no safepoint check is ok. 2675 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag); 2676 assert(n->is_osr_method(), "wrong kind of nmethod"); 2677 nmethod* last = NULL; 2678 nmethod* cur = osr_nmethods_head(); 2679 int max_level = CompLevel_none; // Find the max comp level excluding n 2680 Method* m = n->method(); 2681 // Search for match 2682 bool found = false; 2683 while(cur != NULL && cur != n) { 2684 if (TieredCompilation && m == cur->method()) { 2685 // Find max level before n 2686 max_level = MAX2(max_level, cur->comp_level()); 2687 } 2688 last = cur; 2689 cur = cur->osr_link(); 2690 } 2691 nmethod* next = NULL; 2692 if (cur == n) { 2693 found = true; 2694 next = cur->osr_link(); 2695 if (last == NULL) { 2696 // Remove first element 2697 set_osr_nmethods_head(next); 2698 } else { 2699 last->set_osr_link(next); 2700 } 2701 } 2702 n->set_osr_link(NULL); 2703 if (TieredCompilation) { 2704 cur = next; 2705 while (cur != NULL) { 2706 // Find max level after n 2707 if (m == cur->method()) { 2708 max_level = MAX2(max_level, cur->comp_level()); 2709 } 2710 cur = cur->osr_link(); 2711 } 2712 m->set_highest_osr_comp_level(max_level); 2713 } 2714 return found; 2715 } 2716 2717 int InstanceKlass::mark_osr_nmethods(const Method* m) { 2718 // This is a short non-blocking critical region, so the no safepoint check is ok. 2719 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag); 2720 nmethod* osr = osr_nmethods_head(); 2721 int found = 0; 2722 while (osr != NULL) { 2723 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); 2724 if (osr->method() == m) { 2725 osr->mark_for_deoptimization(); 2726 found++; 2727 } 2728 osr = osr->osr_link(); 2729 } 2730 return found; 2731 } 2732 2733 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const { 2734 // This is a short non-blocking critical region, so the no safepoint check is ok. 2735 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag); 2736 nmethod* osr = osr_nmethods_head(); 2737 nmethod* best = NULL; 2738 while (osr != NULL) { 2739 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain"); 2740 // There can be a time when a c1 osr method exists but we are waiting 2741 // for a c2 version. When c2 completes its osr nmethod we will trash 2742 // the c1 version and only be able to find the c2 version. However 2743 // while we overflow in the c1 code at back branches we don't want to 2744 // try and switch to the same code as we are already running 2745 2746 if (osr->method() == m && 2747 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) { 2748 if (match_level) { 2749 if (osr->comp_level() == comp_level) { 2750 // Found a match - return it. 2751 return osr; 2752 } 2753 } else { 2754 if (best == NULL || (osr->comp_level() > best->comp_level())) { 2755 if (osr->comp_level() == CompLevel_highest_tier) { 2756 // Found the best possible - return it. 2757 return osr; 2758 } 2759 best = osr; 2760 } 2761 } 2762 } 2763 osr = osr->osr_link(); 2764 } 2765 if (best != NULL && best->comp_level() >= comp_level && match_level == false) { 2766 return best; 2767 } 2768 return NULL; 2769 } 2770 2771 oop InstanceKlass::add_member_name(Handle mem_name, bool intern) { 2772 jweak mem_name_wref = JNIHandles::make_weak_global(mem_name); 2773 MutexLocker ml(MemberNameTable_lock); 2774 DEBUG_ONLY(NoSafepointVerifier nsv); 2775 2776 // Check if method has been redefined while taking out MemberNameTable_lock, if so 2777 // return false. We cannot cache obsolete methods. They will crash when the function 2778 // is called! 2779 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name()); 2780 if (method->is_obsolete()) { 2781 return NULL; 2782 } else if (method->is_old()) { 2783 // Replace method with redefined version 2784 java_lang_invoke_MemberName::set_vmtarget(mem_name(), method_with_idnum(method->method_idnum())); 2785 } 2786 2787 if (_member_names == NULL) { 2788 _member_names = new (ResourceObj::C_HEAP, mtClass) MemberNameTable(idnum_allocated_count()); 2789 } 2790 if (intern) { 2791 return _member_names->find_or_add_member_name(mem_name_wref); 2792 } else { 2793 return _member_names->add_member_name(mem_name_wref); 2794 } 2795 } 2796 2797 // ----------------------------------------------------------------------------------------------------- 2798 // Printing 2799 2800 #ifndef PRODUCT 2801 2802 #define BULLET " - " 2803 2804 static const char* state_names[] = { 2805 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error" 2806 }; 2807 2808 static void print_vtable(intptr_t* start, int len, outputStream* st) { 2809 for (int i = 0; i < len; i++) { 2810 intptr_t e = start[i]; 2811 st->print("%d : " INTPTR_FORMAT, i, e); 2812 if (e != 0 && ((Metadata*)e)->is_metaspace_object()) { 2813 st->print(" "); 2814 ((Metadata*)e)->print_value_on(st); 2815 } 2816 st->cr(); 2817 } 2818 } 2819 2820 static void print_vtable(vtableEntry* start, int len, outputStream* st) { 2821 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st); 2822 } 2823 2824 void InstanceKlass::print_on(outputStream* st) const { 2825 assert(is_klass(), "must be klass"); 2826 Klass::print_on(st); 2827 2828 st->print(BULLET"instance size: %d", size_helper()); st->cr(); 2829 st->print(BULLET"klass size: %d", size()); st->cr(); 2830 st->print(BULLET"access: "); access_flags().print_on(st); st->cr(); 2831 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]); 2832 st->print(BULLET"name: "); name()->print_value_on(st); st->cr(); 2833 st->print(BULLET"super: "); super()->print_value_on_maybe_null(st); st->cr(); 2834 st->print(BULLET"sub: "); 2835 Klass* sub = subklass(); 2836 int n; 2837 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) { 2838 if (n < MaxSubklassPrintSize) { 2839 sub->print_value_on(st); 2840 st->print(" "); 2841 } 2842 } 2843 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize); 2844 st->cr(); 2845 2846 if (is_interface()) { 2847 st->print_cr(BULLET"nof implementors: %d", nof_implementors()); 2848 if (nof_implementors() == 1) { 2849 st->print_cr(BULLET"implementor: "); 2850 st->print(" "); 2851 implementor()->print_value_on(st); 2852 st->cr(); 2853 } 2854 } 2855 2856 st->print(BULLET"arrays: "); array_klasses()->print_value_on_maybe_null(st); st->cr(); 2857 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr(); 2858 if (Verbose || WizardMode) { 2859 Array<Method*>* method_array = methods(); 2860 for (int i = 0; i < method_array->length(); i++) { 2861 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr(); 2862 } 2863 } 2864 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr(); 2865 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr(); 2866 if (Verbose && default_methods() != NULL) { 2867 Array<Method*>* method_array = default_methods(); 2868 for (int i = 0; i < method_array->length(); i++) { 2869 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr(); 2870 } 2871 } 2872 if (default_vtable_indices() != NULL) { 2873 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr(); 2874 } 2875 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr(); 2876 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr(); 2877 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr(); 2878 if (class_loader_data() != NULL) { 2879 st->print(BULLET"class loader data: "); 2880 class_loader_data()->print_value_on(st); 2881 st->cr(); 2882 } 2883 st->print(BULLET"host class: "); host_klass()->print_value_on_maybe_null(st); st->cr(); 2884 if (source_file_name() != NULL) { 2885 st->print(BULLET"source file: "); 2886 source_file_name()->print_value_on(st); 2887 st->cr(); 2888 } 2889 if (source_debug_extension() != NULL) { 2890 st->print(BULLET"source debug extension: "); 2891 st->print("%s", source_debug_extension()); 2892 st->cr(); 2893 } 2894 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr(); 2895 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr(); 2896 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr(); 2897 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr(); 2898 { 2899 bool have_pv = false; 2900 // previous versions are linked together through the InstanceKlass 2901 for (InstanceKlass* pv_node = previous_versions(); 2902 pv_node != NULL; 2903 pv_node = pv_node->previous_versions()) { 2904 if (!have_pv) 2905 st->print(BULLET"previous version: "); 2906 have_pv = true; 2907 pv_node->constants()->print_value_on(st); 2908 } 2909 if (have_pv) st->cr(); 2910 } 2911 2912 if (generic_signature() != NULL) { 2913 st->print(BULLET"generic signature: "); 2914 generic_signature()->print_value_on(st); 2915 st->cr(); 2916 } 2917 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr(); 2918 st->print(BULLET"java mirror: "); java_mirror()->print_value_on(st); st->cr(); 2919 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr(); 2920 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st); 2921 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr(); 2922 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st); 2923 st->print_cr(BULLET"---- static fields (%d words):", static_field_size()); 2924 FieldPrinter print_static_field(st); 2925 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field); 2926 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size()); 2927 FieldPrinter print_nonstatic_field(st); 2928 InstanceKlass* ik = const_cast<InstanceKlass*>(this); 2929 ik->do_nonstatic_fields(&print_nonstatic_field); 2930 2931 st->print(BULLET"non-static oop maps: "); 2932 OopMapBlock* map = start_of_nonstatic_oop_maps(); 2933 OopMapBlock* end_map = map + nonstatic_oop_map_count(); 2934 while (map < end_map) { 2935 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1)); 2936 map++; 2937 } 2938 st->cr(); 2939 } 2940 2941 #endif //PRODUCT 2942 2943 void InstanceKlass::print_value_on(outputStream* st) const { 2944 assert(is_klass(), "must be klass"); 2945 if (Verbose || WizardMode) access_flags().print_on(st); 2946 name()->print_value_on(st); 2947 } 2948 2949 #ifndef PRODUCT 2950 2951 void FieldPrinter::do_field(fieldDescriptor* fd) { 2952 _st->print(BULLET); 2953 if (_obj == NULL) { 2954 fd->print_on(_st); 2955 _st->cr(); 2956 } else { 2957 fd->print_on_for(_st, _obj); 2958 _st->cr(); 2959 } 2960 } 2961 2962 2963 void InstanceKlass::oop_print_on(oop obj, outputStream* st) { 2964 Klass::oop_print_on(obj, st); 2965 2966 if (this == SystemDictionary::String_klass()) { 2967 typeArrayOop value = java_lang_String::value(obj); 2968 juint length = java_lang_String::length(obj); 2969 if (value != NULL && 2970 value->is_typeArray() && 2971 length <= (juint) value->length()) { 2972 st->print(BULLET"string: "); 2973 java_lang_String::print(obj, st); 2974 st->cr(); 2975 if (!WizardMode) return; // that is enough 2976 } 2977 } 2978 2979 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj)); 2980 FieldPrinter print_field(st, obj); 2981 do_nonstatic_fields(&print_field); 2982 2983 if (this == SystemDictionary::Class_klass()) { 2984 st->print(BULLET"signature: "); 2985 java_lang_Class::print_signature(obj, st); 2986 st->cr(); 2987 Klass* mirrored_klass = java_lang_Class::as_Klass(obj); 2988 st->print(BULLET"fake entry for mirror: "); 2989 mirrored_klass->print_value_on_maybe_null(st); 2990 st->cr(); 2991 Klass* array_klass = java_lang_Class::array_klass(obj); 2992 st->print(BULLET"fake entry for array: "); 2993 array_klass->print_value_on_maybe_null(st); 2994 st->cr(); 2995 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj)); 2996 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj)); 2997 Klass* real_klass = java_lang_Class::as_Klass(obj); 2998 if (real_klass != NULL && real_klass->is_instance_klass()) { 2999 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field); 3000 } 3001 } else if (this == SystemDictionary::MethodType_klass()) { 3002 st->print(BULLET"signature: "); 3003 java_lang_invoke_MethodType::print_signature(obj, st); 3004 st->cr(); 3005 } 3006 } 3007 3008 #endif //PRODUCT 3009 3010 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) { 3011 st->print("a "); 3012 name()->print_value_on(st); 3013 obj->print_address_on(st); 3014 if (this == SystemDictionary::String_klass() 3015 && java_lang_String::value(obj) != NULL) { 3016 ResourceMark rm; 3017 int len = java_lang_String::length(obj); 3018 int plen = (len < 24 ? len : 12); 3019 char* str = java_lang_String::as_utf8_string(obj, 0, plen); 3020 st->print(" = \"%s\"", str); 3021 if (len > plen) 3022 st->print("...[%d]", len); 3023 } else if (this == SystemDictionary::Class_klass()) { 3024 Klass* k = java_lang_Class::as_Klass(obj); 3025 st->print(" = "); 3026 if (k != NULL) { 3027 k->print_value_on(st); 3028 } else { 3029 const char* tname = type2name(java_lang_Class::primitive_type(obj)); 3030 st->print("%s", tname ? tname : "type?"); 3031 } 3032 } else if (this == SystemDictionary::MethodType_klass()) { 3033 st->print(" = "); 3034 java_lang_invoke_MethodType::print_signature(obj, st); 3035 } else if (java_lang_boxing_object::is_instance(obj)) { 3036 st->print(" = "); 3037 java_lang_boxing_object::print(obj, st); 3038 } else if (this == SystemDictionary::LambdaForm_klass()) { 3039 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj); 3040 if (vmentry != NULL) { 3041 st->print(" => "); 3042 vmentry->print_value_on(st); 3043 } 3044 } else if (this == SystemDictionary::MemberName_klass()) { 3045 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj); 3046 if (vmtarget != NULL) { 3047 st->print(" = "); 3048 vmtarget->print_value_on(st); 3049 } else { 3050 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st); 3051 st->print("."); 3052 java_lang_invoke_MemberName::name(obj)->print_value_on(st); 3053 } 3054 } 3055 } 3056 3057 const char* InstanceKlass::internal_name() const { 3058 return external_name(); 3059 } 3060 3061 void InstanceKlass::print_loading_log(LogLevel::type type, 3062 ClassLoaderData* loader_data, 3063 const char* module_name, 3064 const ClassFileStream* cfs) const { 3065 ResourceMark rm; 3066 outputStream* log; 3067 3068 assert(type == LogLevel::Info || type == LogLevel::Debug, "sanity"); 3069 3070 if (type == LogLevel::Info) { 3071 log = Log(class, load)::info_stream(); 3072 } else { 3073 assert(type == LogLevel::Debug, 3074 "print_loading_log supports only Debug and Info levels"); 3075 log = Log(class, load)::debug_stream(); 3076 } 3077 3078 // Name and class hierarchy info 3079 log->print("%s", external_name()); 3080 3081 // Source 3082 if (cfs != NULL) { 3083 if (cfs->source() != NULL) { 3084 if (module_name != NULL) { 3085 if (ClassLoader::is_jrt(cfs->source())) { 3086 log->print(" source: jrt:/%s", module_name); 3087 } else { 3088 log->print(" source: %s", cfs->source()); 3089 } 3090 } else { 3091 log->print(" source: %s", cfs->source()); 3092 } 3093 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) { 3094 Thread* THREAD = Thread::current(); 3095 Klass* caller = 3096 THREAD->is_Java_thread() 3097 ? ((JavaThread*)THREAD)->security_get_caller_class(1) 3098 : NULL; 3099 // caller can be NULL, for example, during a JVMTI VM_Init hook 3100 if (caller != NULL) { 3101 log->print(" source: instance of %s", caller->external_name()); 3102 } else { 3103 // source is unknown 3104 } 3105 } else { 3106 oop class_loader = loader_data->class_loader(); 3107 log->print(" source: %s", class_loader->klass()->external_name()); 3108 } 3109 } else { 3110 log->print(" source: shared objects file"); 3111 } 3112 3113 if (type == LogLevel::Debug) { 3114 // Class hierarchy info 3115 log->print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT, 3116 p2i(this), p2i(superklass())); 3117 3118 if (local_interfaces() != NULL && local_interfaces()->length() > 0) { 3119 log->print(" interfaces:"); 3120 int length = local_interfaces()->length(); 3121 for (int i = 0; i < length; i++) { 3122 log->print(" " INTPTR_FORMAT, 3123 p2i(InstanceKlass::cast(local_interfaces()->at(i)))); 3124 } 3125 } 3126 3127 // Class loader 3128 log->print(" loader: ["); 3129 loader_data->print_value_on(log); 3130 log->print("]"); 3131 3132 // Classfile checksum 3133 if (cfs) { 3134 log->print(" bytes: %d checksum: %08x", 3135 cfs->length(), 3136 ClassLoader::crc32(0, (const char*)cfs->buffer(), 3137 cfs->length())); 3138 } 3139 } 3140 log->cr(); 3141 } 3142 3143 #if INCLUDE_SERVICES 3144 // Size Statistics 3145 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const { 3146 Klass::collect_statistics(sz); 3147 3148 sz->_inst_size = wordSize * size_helper(); 3149 sz->_vtab_bytes = wordSize * vtable_length(); 3150 sz->_itab_bytes = wordSize * itable_length(); 3151 sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size(); 3152 3153 int n = 0; 3154 n += (sz->_methods_array_bytes = sz->count_array(methods())); 3155 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering())); 3156 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces())); 3157 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces())); 3158 n += (sz->_fields_bytes = sz->count_array(fields())); 3159 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes())); 3160 sz->_ro_bytes += n; 3161 3162 const ConstantPool* cp = constants(); 3163 if (cp) { 3164 cp->collect_statistics(sz); 3165 } 3166 3167 const Annotations* anno = annotations(); 3168 if (anno) { 3169 anno->collect_statistics(sz); 3170 } 3171 3172 const Array<Method*>* methods_array = methods(); 3173 if (methods()) { 3174 for (int i = 0; i < methods_array->length(); i++) { 3175 Method* method = methods_array->at(i); 3176 if (method) { 3177 sz->_method_count ++; 3178 method->collect_statistics(sz); 3179 } 3180 } 3181 } 3182 } 3183 #endif // INCLUDE_SERVICES 3184 3185 // Verification 3186 3187 class VerifyFieldClosure: public OopClosure { 3188 protected: 3189 template <class T> void do_oop_work(T* p) { 3190 oop obj = oopDesc::load_decode_heap_oop(p); 3191 if (!obj->is_oop_or_null()) { 3192 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj)); 3193 Universe::print_on(tty); 3194 guarantee(false, "boom"); 3195 } 3196 } 3197 public: 3198 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); } 3199 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); } 3200 }; 3201 3202 void InstanceKlass::verify_on(outputStream* st) { 3203 #ifndef PRODUCT 3204 // Avoid redundant verifies, this really should be in product. 3205 if (_verify_count == Universe::verify_count()) return; 3206 _verify_count = Universe::verify_count(); 3207 #endif 3208 3209 // Verify Klass 3210 Klass::verify_on(st); 3211 3212 // Verify that klass is present in ClassLoaderData 3213 guarantee(class_loader_data()->contains_klass(this), 3214 "this class isn't found in class loader data"); 3215 3216 // Verify vtables 3217 if (is_linked()) { 3218 // $$$ This used to be done only for m/s collections. Doing it 3219 // always seemed a valid generalization. (DLD -- 6/00) 3220 vtable().verify(st); 3221 } 3222 3223 // Verify first subklass 3224 if (subklass() != NULL) { 3225 guarantee(subklass()->is_klass(), "should be klass"); 3226 } 3227 3228 // Verify siblings 3229 Klass* super = this->super(); 3230 Klass* sib = next_sibling(); 3231 if (sib != NULL) { 3232 if (sib == this) { 3233 fatal("subclass points to itself " PTR_FORMAT, p2i(sib)); 3234 } 3235 3236 guarantee(sib->is_klass(), "should be klass"); 3237 guarantee(sib->super() == super, "siblings should have same superklass"); 3238 } 3239 3240 // Verify implementor fields 3241 Klass* im = implementor(); 3242 if (im != NULL) { 3243 guarantee(is_interface(), "only interfaces should have implementor set"); 3244 guarantee(im->is_klass(), "should be klass"); 3245 guarantee(!im->is_interface() || im == this, 3246 "implementors cannot be interfaces"); 3247 } 3248 3249 // Verify local interfaces 3250 if (local_interfaces()) { 3251 Array<Klass*>* local_interfaces = this->local_interfaces(); 3252 for (int j = 0; j < local_interfaces->length(); j++) { 3253 Klass* e = local_interfaces->at(j); 3254 guarantee(e->is_klass() && e->is_interface(), "invalid local interface"); 3255 } 3256 } 3257 3258 // Verify transitive interfaces 3259 if (transitive_interfaces() != NULL) { 3260 Array<Klass*>* transitive_interfaces = this->transitive_interfaces(); 3261 for (int j = 0; j < transitive_interfaces->length(); j++) { 3262 Klass* e = transitive_interfaces->at(j); 3263 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface"); 3264 } 3265 } 3266 3267 // Verify methods 3268 if (methods() != NULL) { 3269 Array<Method*>* methods = this->methods(); 3270 for (int j = 0; j < methods->length(); j++) { 3271 guarantee(methods->at(j)->is_method(), "non-method in methods array"); 3272 } 3273 for (int j = 0; j < methods->length() - 1; j++) { 3274 Method* m1 = methods->at(j); 3275 Method* m2 = methods->at(j + 1); 3276 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly"); 3277 } 3278 } 3279 3280 // Verify method ordering 3281 if (method_ordering() != NULL) { 3282 Array<int>* method_ordering = this->method_ordering(); 3283 int length = method_ordering->length(); 3284 if (JvmtiExport::can_maintain_original_method_order() || 3285 ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) { 3286 guarantee(length == methods()->length(), "invalid method ordering length"); 3287 jlong sum = 0; 3288 for (int j = 0; j < length; j++) { 3289 int original_index = method_ordering->at(j); 3290 guarantee(original_index >= 0, "invalid method ordering index"); 3291 guarantee(original_index < length, "invalid method ordering index"); 3292 sum += original_index; 3293 } 3294 // Verify sum of indices 0,1,...,length-1 3295 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum"); 3296 } else { 3297 guarantee(length == 0, "invalid method ordering length"); 3298 } 3299 } 3300 3301 // Verify default methods 3302 if (default_methods() != NULL) { 3303 Array<Method*>* methods = this->default_methods(); 3304 for (int j = 0; j < methods->length(); j++) { 3305 guarantee(methods->at(j)->is_method(), "non-method in methods array"); 3306 } 3307 for (int j = 0; j < methods->length() - 1; j++) { 3308 Method* m1 = methods->at(j); 3309 Method* m2 = methods->at(j + 1); 3310 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly"); 3311 } 3312 } 3313 3314 // Verify JNI static field identifiers 3315 if (jni_ids() != NULL) { 3316 jni_ids()->verify(this); 3317 } 3318 3319 // Verify other fields 3320 if (array_klasses() != NULL) { 3321 guarantee(array_klasses()->is_klass(), "should be klass"); 3322 } 3323 if (constants() != NULL) { 3324 guarantee(constants()->is_constantPool(), "should be constant pool"); 3325 } 3326 const Klass* host = host_klass(); 3327 if (host != NULL) { 3328 guarantee(host->is_klass(), "should be klass"); 3329 } 3330 } 3331 3332 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) { 3333 Klass::oop_verify_on(obj, st); 3334 VerifyFieldClosure blk; 3335 obj->oop_iterate_no_header(&blk); 3336 } 3337 3338 3339 // JNIid class for jfieldIDs only 3340 // Note to reviewers: 3341 // These JNI functions are just moved over to column 1 and not changed 3342 // in the compressed oops workspace. 3343 JNIid::JNIid(Klass* holder, int offset, JNIid* next) { 3344 _holder = holder; 3345 _offset = offset; 3346 _next = next; 3347 debug_only(_is_static_field_id = false;) 3348 } 3349 3350 3351 JNIid* JNIid::find(int offset) { 3352 JNIid* current = this; 3353 while (current != NULL) { 3354 if (current->offset() == offset) return current; 3355 current = current->next(); 3356 } 3357 return NULL; 3358 } 3359 3360 void JNIid::deallocate(JNIid* current) { 3361 while (current != NULL) { 3362 JNIid* next = current->next(); 3363 delete current; 3364 current = next; 3365 } 3366 } 3367 3368 3369 void JNIid::verify(Klass* holder) { 3370 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields(); 3371 int end_field_offset; 3372 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize); 3373 3374 JNIid* current = this; 3375 while (current != NULL) { 3376 guarantee(current->holder() == holder, "Invalid klass in JNIid"); 3377 #ifdef ASSERT 3378 int o = current->offset(); 3379 if (current->is_static_field_id()) { 3380 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid"); 3381 } 3382 #endif 3383 current = current->next(); 3384 } 3385 } 3386 3387 3388 #ifdef ASSERT 3389 void InstanceKlass::set_init_state(ClassState state) { 3390 bool good_state = is_shared() ? (_init_state <= state) 3391 : (_init_state < state); 3392 assert(good_state || state == allocated, "illegal state transition"); 3393 _init_state = (u1)state; 3394 } 3395 #endif 3396 3397 #if INCLUDE_JVMTI 3398 3399 // RedefineClasses() support for previous versions 3400 3401 // Globally, there is at least one previous version of a class to walk 3402 // during class unloading, which is saved because old methods in the class 3403 // are still running. Otherwise the previous version list is cleaned up. 3404 bool InstanceKlass::_has_previous_versions = false; 3405 3406 // Returns true if there are previous versions of a class for class 3407 // unloading only. Also resets the flag to false. purge_previous_version 3408 // will set the flag to true if there are any left, i.e., if there's any 3409 // work to do for next time. This is to avoid the expensive code cache 3410 // walk in CLDG::do_unloading(). 3411 bool InstanceKlass::has_previous_versions_and_reset() { 3412 bool ret = _has_previous_versions; 3413 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s", 3414 ret ? "true" : "false"); 3415 _has_previous_versions = false; 3416 return ret; 3417 } 3418 3419 // Purge previous versions before adding new previous versions of the class and 3420 // during class unloading. 3421 void InstanceKlass::purge_previous_version_list() { 3422 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 3423 assert(has_been_redefined(), "Should only be called for main class"); 3424 3425 // Quick exit. 3426 if (previous_versions() == NULL) { 3427 return; 3428 } 3429 3430 // This klass has previous versions so see what we can cleanup 3431 // while it is safe to do so. 3432 3433 int deleted_count = 0; // leave debugging breadcrumbs 3434 int live_count = 0; 3435 ClassLoaderData* loader_data = class_loader_data(); 3436 assert(loader_data != NULL, "should never be null"); 3437 3438 ResourceMark rm; 3439 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name()); 3440 3441 // previous versions are linked together through the InstanceKlass 3442 InstanceKlass* pv_node = previous_versions(); 3443 InstanceKlass* last = this; 3444 int version = 0; 3445 3446 // check the previous versions list 3447 for (; pv_node != NULL; ) { 3448 3449 ConstantPool* pvcp = pv_node->constants(); 3450 assert(pvcp != NULL, "cp ref was unexpectedly cleared"); 3451 3452 if (!pvcp->on_stack()) { 3453 // If the constant pool isn't on stack, none of the methods 3454 // are executing. Unlink this previous_version. 3455 // The previous version InstanceKlass is on the ClassLoaderData deallocate list 3456 // so will be deallocated during the next phase of class unloading. 3457 log_trace(redefine, class, iklass, purge) 3458 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node)); 3459 // For debugging purposes. 3460 pv_node->set_is_scratch_class(); 3461 // Unlink from previous version list. 3462 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data"); 3463 InstanceKlass* next = pv_node->previous_versions(); 3464 pv_node->link_previous_versions(NULL); // point next to NULL 3465 last->link_previous_versions(next); 3466 // Add to the deallocate list after unlinking 3467 loader_data->add_to_deallocate_list(pv_node); 3468 pv_node = next; 3469 deleted_count++; 3470 version++; 3471 continue; 3472 } else { 3473 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node)); 3474 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder"); 3475 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack"); 3476 live_count++; 3477 // found a previous version for next time we do class unloading 3478 _has_previous_versions = true; 3479 } 3480 3481 // At least one method is live in this previous version. 3482 // Reset dead EMCP methods not to get breakpoints. 3483 // All methods are deallocated when all of the methods for this class are no 3484 // longer running. 3485 Array<Method*>* method_refs = pv_node->methods(); 3486 if (method_refs != NULL) { 3487 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length()); 3488 for (int j = 0; j < method_refs->length(); j++) { 3489 Method* method = method_refs->at(j); 3490 3491 if (!method->on_stack()) { 3492 // no breakpoints for non-running methods 3493 if (method->is_running_emcp()) { 3494 method->set_running_emcp(false); 3495 } 3496 } else { 3497 assert (method->is_obsolete() || method->is_running_emcp(), 3498 "emcp method cannot run after emcp bit is cleared"); 3499 log_trace(redefine, class, iklass, purge) 3500 ("purge: %s(%s): prev method @%d in version @%d is alive", 3501 method->name()->as_C_string(), method->signature()->as_C_string(), j, version); 3502 } 3503 } 3504 } 3505 // next previous version 3506 last = pv_node; 3507 pv_node = pv_node->previous_versions(); 3508 version++; 3509 } 3510 log_trace(redefine, class, iklass, purge) 3511 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count); 3512 } 3513 3514 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods, 3515 int emcp_method_count) { 3516 int obsolete_method_count = old_methods->length() - emcp_method_count; 3517 3518 if (emcp_method_count != 0 && obsolete_method_count != 0 && 3519 _previous_versions != NULL) { 3520 // We have a mix of obsolete and EMCP methods so we have to 3521 // clear out any matching EMCP method entries the hard way. 3522 int local_count = 0; 3523 for (int i = 0; i < old_methods->length(); i++) { 3524 Method* old_method = old_methods->at(i); 3525 if (old_method->is_obsolete()) { 3526 // only obsolete methods are interesting 3527 Symbol* m_name = old_method->name(); 3528 Symbol* m_signature = old_method->signature(); 3529 3530 // previous versions are linked together through the InstanceKlass 3531 int j = 0; 3532 for (InstanceKlass* prev_version = _previous_versions; 3533 prev_version != NULL; 3534 prev_version = prev_version->previous_versions(), j++) { 3535 3536 Array<Method*>* method_refs = prev_version->methods(); 3537 for (int k = 0; k < method_refs->length(); k++) { 3538 Method* method = method_refs->at(k); 3539 3540 if (!method->is_obsolete() && 3541 method->name() == m_name && 3542 method->signature() == m_signature) { 3543 // The current RedefineClasses() call has made all EMCP 3544 // versions of this method obsolete so mark it as obsolete 3545 log_trace(redefine, class, iklass, add) 3546 ("%s(%s): flush obsolete method @%d in version @%d", 3547 m_name->as_C_string(), m_signature->as_C_string(), k, j); 3548 3549 method->set_is_obsolete(); 3550 break; 3551 } 3552 } 3553 3554 // The previous loop may not find a matching EMCP method, but 3555 // that doesn't mean that we can optimize and not go any 3556 // further back in the PreviousVersion generations. The EMCP 3557 // method for this generation could have already been made obsolete, 3558 // but there still may be an older EMCP method that has not 3559 // been made obsolete. 3560 } 3561 3562 if (++local_count >= obsolete_method_count) { 3563 // no more obsolete methods so bail out now 3564 break; 3565 } 3566 } 3567 } 3568 } 3569 } 3570 3571 // Save the scratch_class as the previous version if any of the methods are running. 3572 // The previous_versions are used to set breakpoints in EMCP methods and they are 3573 // also used to clean MethodData links to redefined methods that are no longer running. 3574 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class, 3575 int emcp_method_count) { 3576 assert(Thread::current()->is_VM_thread(), 3577 "only VMThread can add previous versions"); 3578 3579 ResourceMark rm; 3580 log_trace(redefine, class, iklass, add) 3581 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count); 3582 3583 // Clean out old previous versions for this class 3584 purge_previous_version_list(); 3585 3586 // Mark newly obsolete methods in remaining previous versions. An EMCP method from 3587 // a previous redefinition may be made obsolete by this redefinition. 3588 Array<Method*>* old_methods = scratch_class->methods(); 3589 mark_newly_obsolete_methods(old_methods, emcp_method_count); 3590 3591 // If the constant pool for this previous version of the class 3592 // is not marked as being on the stack, then none of the methods 3593 // in this previous version of the class are on the stack so 3594 // we don't need to add this as a previous version. 3595 ConstantPool* cp_ref = scratch_class->constants(); 3596 if (!cp_ref->on_stack()) { 3597 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running"); 3598 // For debugging purposes. 3599 scratch_class->set_is_scratch_class(); 3600 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class); 3601 return; 3602 } 3603 3604 if (emcp_method_count != 0) { 3605 // At least one method is still running, check for EMCP methods 3606 for (int i = 0; i < old_methods->length(); i++) { 3607 Method* old_method = old_methods->at(i); 3608 if (!old_method->is_obsolete() && old_method->on_stack()) { 3609 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that 3610 // we can add breakpoints for it. 3611 3612 // We set the method->on_stack bit during safepoints for class redefinition 3613 // and use this bit to set the is_running_emcp bit. 3614 // After the safepoint, the on_stack bit is cleared and the running emcp 3615 // method may exit. If so, we would set a breakpoint in a method that 3616 // is never reached, but this won't be noticeable to the programmer. 3617 old_method->set_running_emcp(true); 3618 log_trace(redefine, class, iklass, add) 3619 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method)); 3620 } else if (!old_method->is_obsolete()) { 3621 log_trace(redefine, class, iklass, add) 3622 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method)); 3623 } 3624 } 3625 } 3626 3627 // Add previous version if any methods are still running. 3628 // Set has_previous_version flag for processing during class unloading. 3629 _has_previous_versions = true; 3630 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack."); 3631 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version"); 3632 scratch_class->link_previous_versions(previous_versions()); 3633 link_previous_versions(scratch_class); 3634 } // end add_previous_version() 3635 3636 #endif // INCLUDE_JVMTI 3637 3638 Method* InstanceKlass::method_with_idnum(int idnum) { 3639 Method* m = NULL; 3640 if (idnum < methods()->length()) { 3641 m = methods()->at(idnum); 3642 } 3643 if (m == NULL || m->method_idnum() != idnum) { 3644 for (int index = 0; index < methods()->length(); ++index) { 3645 m = methods()->at(index); 3646 if (m->method_idnum() == idnum) { 3647 return m; 3648 } 3649 } 3650 // None found, return null for the caller to handle. 3651 return NULL; 3652 } 3653 return m; 3654 } 3655 3656 3657 Method* InstanceKlass::method_with_orig_idnum(int idnum) { 3658 if (idnum >= methods()->length()) { 3659 return NULL; 3660 } 3661 Method* m = methods()->at(idnum); 3662 if (m != NULL && m->orig_method_idnum() == idnum) { 3663 return m; 3664 } 3665 // Obsolete method idnum does not match the original idnum 3666 for (int index = 0; index < methods()->length(); ++index) { 3667 m = methods()->at(index); 3668 if (m->orig_method_idnum() == idnum) { 3669 return m; 3670 } 3671 } 3672 // None found, return null for the caller to handle. 3673 return NULL; 3674 } 3675 3676 3677 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) { 3678 InstanceKlass* holder = get_klass_version(version); 3679 if (holder == NULL) { 3680 return NULL; // The version of klass is gone, no method is found 3681 } 3682 Method* method = holder->method_with_orig_idnum(idnum); 3683 return method; 3684 } 3685 3686 #if INCLUDE_JVMTI 3687 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() { 3688 if (MetaspaceShared::is_in_shared_space(_cached_class_file)) { 3689 // Ignore the archived class stream data 3690 return NULL; 3691 } else { 3692 return _cached_class_file; 3693 } 3694 } 3695 3696 jint InstanceKlass::get_cached_class_file_len() { 3697 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file); 3698 } 3699 3700 unsigned char * InstanceKlass::get_cached_class_file_bytes() { 3701 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file); 3702 } 3703 3704 #if INCLUDE_CDS 3705 JvmtiCachedClassFileData* InstanceKlass::get_archived_class_data() { 3706 assert(this->is_shared(), "class should be shared"); 3707 if (MetaspaceShared::is_in_shared_space(_cached_class_file)) { 3708 return _cached_class_file; 3709 } else { 3710 return NULL; 3711 } 3712 } 3713 #endif 3714 #endif